I understood this moment by myself some time later (the passive work of the subconscious), but leaved the post as is for the next time. :)

The main problem is not in distribution of my product or absence of respect/thanks for me.
The main problems are:
1) in the fact of SELLING fun-product created for free use by gog to the publisher (Square Enix);
2) in the fact of not providing the appropriate info for me (if I knew that the patch will be included into official distributions of the game, I had create additional fixes like I distibute now (at least, achievements engine for Steam + updated bink engine), and they were included already in the official distributive of SR1; now it is impossible to do due to stupidness/laziness/f*ckiness of SE);
3) in the fact of no support for the product they (gog) "improved" - look at their activity here.

P.S.: and again, about pixelization - I remember that I saw this moment on my PC and I solved it. Now I use updated version of my patch which is included dgVoodoo, no more. (And official version of SR1.)

For dgVoodoo, how it's work ? Install the game and install this program and it's ok ?

Look here.
You need just to copy files from the folder MS of dgVoodoo into the game folder.
dgVoodooCpl.exe (which was early dgVoodooSetup.exe) can be placed in any folder you like, it does not matter.
Also - after first run of SR1 - on the page DirectX of dgVoodoo Control Panel disable its Watermark.

Ok thanks

So I tried and I did not understand How it works

I install the game, Voodoo

http://dege.freeweb.hu/dgVoodoo2/QuickGuide.html

I'm stuck at the question 2 with Glide.dll and all.. What exatly I put in the game data ?

SR1 uses DirectX, so you need to copy 3 files from the MS folder into the game folder, as I said already early.
The game will use (load) ddraw.dll (DX-wrapper of old DX through DX11) from its folder instead of system ones.

http://dege.freeweb.hu/dgVoodoo2/dgVoodoo2.html

Can you tell me what to download please ?

http://dege.freeweb.hu/dgVoodoo2/dgVoodoo2_55_4.zip

Thanks what next?

https://www.gog.com/forum/legacy_of_kain_series/hd_cinematics/post18

Ok so now i have "dgvoodoo" on the Bottom right in game but that's tall : intro still the same : i can't see anything.

Screen :

http://image.noelshack.com/fichiers/2018/43/2/1540291530-dg.jpg

In the launch menu i have this :

http://www.noelshack.com/2018-43-2-1540291574-dg-2.png

I tried all : pilots and resolution.

Game Folder :
http://www.noelshack.com/2018-43-2-1540291729-dg-3.png

What am I doing wrong ?

Nothing. Sooner dgVoodoo can't help with this problem. I checked SR1 on my PC - no pixelization at any settings.
Though, there is one moment: why do you choose in the settings at the start Primary VideoCard, not nVidia ones?

Fuck it ! I'm giving up !

Thanks Hate_gog for your help.