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As of May 2021 my current fully working MOD install order for BG2 on Windows 10.
This is for BG2 complete edition (the original games), not the Enhanced Edition versions. Simply because I prefer the <uncompressed> art style and original UI and just general feel of things.

Before playing, NVIDIA control panel > Set scaling mode at Aspect Ratio. Perform scaling on GPU and check the <Override the scaling mod set by games and programs>. Doing this gives you original working FULL SCREEN 4:3 aspect ratio of the game and makes things work with 3d acceleration on a 34 inch monitor. Its the ONLY way I could make it work with Fullscreen + 3d acceleration (without having it become a tiny window in the middle of the fullscreen). It looks great.
In the BG2config.exe all performance sliders are at their maximum, 3d acceleration ON, cache size at 2000mg and unlock the resolution to 1024.
If you have major stuttering slowdowns during the games that is 100% dues to low mem sounds. A temporary very easy fix is turning the in game Sounds> Ambient volume slider all the way down. This is done until you install the last BG2 mod, generalized biffing (it <biffs> gigs of mod data into a couple hundred mg) Afterwards everything runs fast and super smooth.

BG2 MODS general install order. Highly recommended mods with a * (always check for their latest versions, some here have not been updated. Item revisions and Spell revisions components needs to be installed at two different times.)

* TobEX 26
* BG2 Fixpack V13
* Ascension 2.015
* 1PPv4.2

Tortured Soul Quest V7
Every Mod and Dog v11
PlanarSphereMod 26e(+fix)
The tower of deception 4.0.3
* Assassinations v16
Back to Brynnlaw v8
The sell swords v8
* Tales of the deep garden v12.6
* Innershade v10.4
* The white queen v6.8
I shall never forget v5.8
Eilistraee song 6.8

Imoen Friendship v3.6
Angelo v8
Xulaye v2.0
Varshoon v6.4
Darian v2.4
* Yvette romance 4.1
* Adrian v5.0
Arath v4.0 !
SolaufeinNPC 1.04
* Kelsey v6

* Banter pack v17
* IEP extended banter v5.7
Viconia friendship v4.5
Mazzy friedship v3.5
Yoshimo friendship 4.5
Yoshimos remorse V2
Jans Extended quest1.5
Korgan friendship v1.6
Valygar friendship v1.4
Sarevok friendship v2.6
* NPC flirt pack v1.07
* Romantic encounters v15
Haerdalis friendship v1.2
Cerned friendship v1.3
Minsc friendship v1.2
Fade v5.6

Lucy the wyvern v5.0
Logre et le gnome une histoire de bleu V2
* Almaterias restoration project v8.4

* Revised battles v6.3
* Unfinished business v28
* Dingos quest pack v3.5
Alternatives v15
* The wheels of prophecy v8.3 (change folder name! To: /wheels.tp2/)
* Crossed banter pack v19
Throne of Bhaal Revisited Beta4 bwp fix

RTT Item pack v1.2
The unusual oddities shop v5.0
Cliffkey v7
Food and Herbal mod v1.03
Jans Alchemy v8.1

* Item Revisions V4b10 + revised (1) 1.3.4 <main component> only.
IWDification VBeta 6
* Spell revisions + revised (1) 1.3.201 all components except <update NPCs spellbook>

NPC kitpackV5
Prestige Kit Pack V3

Animal Companion v1.6
* Song and silence v10
* Sword and fist v9
* Rogue rebalancing (1) v4.92
Daulmakans Item PackV1.8

* Spell revisions (2) V4 Beta18 1.3.201 <update NPC spellbook> component.

Infinity Animation Beta5 [complicated install sequence, need to download all wanted animation files]
TanarriWyvernFIx
Bearanimations

* Item revisions (2) v4 beta10 1.3.4 All other components.
Unique artifacts v7.2

* The tweaks anthology V9
Infinity Sounds V1.3
* Sword coast stratagems v33.7
* Atweaks v4.53

* Paintbgee
* BG2improvedGUI 3.13
Infinity Sounds 1.3

Widescreen mod

* Generalized biffing 2.5
Post edited June 06, 2021 by mr_daruman
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GoJays2025: Update: If the Gibberlings3 site is down the files can be found here: http://www.camagna.net/g3mirror/g3_emergency_mirror.html
Update: BGT or EasyTutu? Please see the bottom of this post.

This post is to help people get the best vanilla experience. I didn't include anything that adds a lot of new content since I believe your first playthrough should resemble as closely to the original as possible. If you're wondering about Unfinished Business, you're free to skip it; it is absolutely non-essential.

Note: If you're on Windows 7 you might want to install the games in a directory other than C:\Program Files or C:\Program Files (x86) to avoid potential problems. C:\Games should work.

Part 1
You probably know that you can play the original Baldur's Gate content using the much improved Baldur's Gate 2 engine. The first part of this guide is to help you combine the two into essentially one huge game. If you are only playing Baldur's Gate 2 please proceed to the second part of this guide.

1. Fully install Baldur's Gate: The Original Saga
2. Fully install Baldur's Gate II Complete. If you're installing from CD, make sure you update it to version 26498.
3. Download Baldur's Gate II Fixpack (Download links are on the left side) and extract it to your Baldur's Gate II directory.
4. Run the newly extracted setup-bg2fixpack.exe (if not automatically started).
5. It is safe to select yes for all the optional fixes, but if you want to learn about each in detail, consult the readme file that comes with the fixpack.
6. Download BGT-WeiDU and extract it in your Baldur's Gate II directory.
7. Run the newly extracted Setup-BGT.exe and follow the instructions. You may need to run it in administrative mode in Windows Vista/7.
8. Enter Baldur's Gate I's directory when asked (if not already provided)
9. Wait for BGT-WeiDU to finish installing.
10. OPTIONAL: Download and install Baldur's Gate 1 Unfinished Business as well as BG 2 Unfinished Business. These mods restore things that were previously cut from the released product, so while you don't need them, and they do add new content, they're pretty nice to have, especially if this is not your first time.
11. Download the widescreen mod and apply it in the same manner as the fixpack. This makes it possible to play the game in high resolutions and in widescreen format.
12. OPTIONAL: Download and install any user-created material (banter packs, expansion mods, new NPCs, etc.)
13. Go to your Baldur's Gate II directory, then find and run the file Setup-BGTMusic.exe and select 'Hybrid Baldur’s Gate/Shadows of Amn/Throne of Bhaal music'. This makes it possible to hear the original Baldur's Gate music when playing Baldur's Gate I.
14. OPTIONAL: (for more experienced users) Download Baldur's Gate II Tweak Pack and apply it in the same way as the fixpack. Consult the readme file for details of each tweak - too many to list here. If you don't know what a tweak does even after consulting the readme, just skip it.
15. Remove the Baldur's Gate I installation if you wish - it's done its job!

Now you should be able to play the game all the way from Baldur's Gate I to the end of Throne of Bhaal in one continuous game!

To begin your journey:
There should be 3 buttons that greet you on the first menu screen - "Baldur's Gate", "Throne of Bhaal", and "Quit Game".
Click on "Baldur's Gate".
Then click on "Single Player".
The menu that comes up after will have "New Game", "Load Game", "Back", and "New BG2 Game".
Click on "New Game" to start from Baldur's Gate 1 or "New BG2 Game" to start from Baldur's Gate 2.

Enjoy!

Part 2
For people who only wishes to play Baldur's Gate II.

1. Install Baldur's Gate II
2. Download Baldur's Gate II Fixpack (Download links are on the left side) and extract it to your Baldur's Gate II directory.
3. Run the newly extracted setup-bg2fixpack.exe (if not automatically started).
4. It is safe to select yes for all the optional fixes, but if you want to learn about each in detail, consult the readme file that comes with the fixpack.
5. OPTIONAL: Download and install BG 2 Unfinished Business. This mod restores things that were previously cut from the released product, so while you don't need it, and it does add new content, it's pretty nice to have, especially if this is not your first time playing.
6. Download the widescreen mod and apply it in the same manner as the fixpack. This makes it possible to play the game in high resolutions and in widescreen format.
7. OPTIONAL: Download and install any user-created material (banter packs, expansion mods, new NPCs, etc.).
8. OPTIONAL: (for more experienced users) Download Baldur's Gate II Tweak Pack and apply it in the same way as the fixpack. Consult the readme file for details of each tweak - too many to list here. If you don't know what a tweak does even after consulting the readme, just skip it.

Enjoy!

-------------------------------------------
BGT or EasyTutu?
This guide uses the BGT mod, but you may have noticed another mod that exists to utilize the BG2 engine for BG1 - EasyTutu. If you're unclear about their differences, here's what you need to consider:
BGT:
- BG1 is bridged to BG2 via a very short additional scripted scene. However, it's pretty clear at that point that one game has ended and another is about to start.
- The NPCs' stats are carried over to BG2. Whatever level and whatever stats they had at the end of BG1, when (and if) you meet up with them again in BG2, they will still carry those same stats. This is another feature to maintain continuity throughout the 2 games.
- No need to import your character into BG2 after BG1 - BGT does it for you.

EasyTutu
- Only updates BG1 to use the BG2 engine - they're still kept as separate games.
- You must import your saved game from BG1 over to BG2 when you're ready to start a new game.
- BG2 will be unmodified (i.e. the NPCs' stats will be whatever was programmed into the game, any progress they had in BG1 won't be reflected here).

Basically it comes down to whether you want to keep them as completely separate games (or if you just want to play BG1 only) or try to preserve the continuity between the two games. If you are interested in EasyTutu please take a look at this guide by rartino.
The Unfinished Business mods have a new site:

https://www.pocketplane.net/unfinished-business/