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I've seen a few threads asking how to get the latest experimental version of Factorio, and it's not explained clearly anywhere. So here is a quick guide on how to get the latest updates for Factorio.

1. Go to 'My Account>Games>Factorio>More' & select 'Serial Keys'.
2. Copy your serial Key.
3. Go to Factorio.com & make an account (or login if you have one already). Click on your username in the top right. Then click on 'Upgrade' & enter your serial key.
4.Launch Factorio and go to 'Options>Other' ensure that both 'Check for updates' & 'Enable experimental updates are checked.
5.Login using the same username & password you used of Factorio.com.
6.Next time you run the game, it'll ask you if you want to update (if there are new updates avaliable), click 'Update Now'. It might take a while, but afterwards, Factorio will have updated itself.

If you're using Galaxy, see gourgouilloult's post below for step 7.
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Post edited April 18, 2018 by T.Hodd
If I may add a 7: once the latest version you've upgraded to through the game itself hits GOG, just run a "check / repair" from the game page in Galaxy. Otherwise Galaxy will try to upgrade your game, realize it's not installed as it's supposed to (since you upgraded earlier from within the game), then complain and fail to "upgrade" and, quite possibly, not even allow you to launch it.

The "check/repair" step will just allow Galaxy to verify that your files are already in line with the new version and it'll settle to leave everything as is, just checking another box under "currently installed version" ;-)

Alternatively, you can also prevent Galaxy from trying to upgrade the game at all, but you might not get some new stuff along the road, like e.g. achievements, if they are some day added to the game in Galaxy.

PS: this should get a sticky ^^
Post edited April 18, 2018 by gourgouilloult
Same here, can't access the disk for update, I manually check & repair and wokred to upgrade the game in client (GOG) for version 0.16.36.
Post edited April 18, 2018 by adryanusboy
Thank you. This post was very helpful.
Is this guide still needed? At least in galaxy, I can just activate beta channels and it will give me... I'm new to this game so I don't know what to expect inside, but the version numbers and uploaded date look quite recent (see attachment).
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Post edited May 01, 2019 by huan
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huan: Is this guide still needed? At least in galaxy, I can just activate beta channels and it will give me... I'm new to this game so I don't know what to expect inside, but the version numbers and uploaded date look quite recent (see attachment).
It's not needed for updates, but a factorio.com account is required for multiplayer (steps 1,2,3,5)
Post edited May 06, 2019 by dominikr86