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Klonan: Hi,

We are adding serial keys for GOG users on thursday if all goes to plan,
This will let you upgrade to the full membership
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kage598: I'm also having the "Upgrade code not found" issue.
Ditto....:(
It works for me now!
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kage598: It works for me now!
Mine too!
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kage598: It works for me now!
Mine works also! :D
now it works for me as well :D
thank you~
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Foolin: now it works for me as well :D
thank you~
Mine too now!

"Your account has been successfuly upgraded."
Hey just confirming for new GOG purchasers,

go to your GOG account>click factorio (where you would click to download exe/msi)> click MORE > Serial Keys

Use this key to register/upgrade at Factorio.com