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Is there any way to verify the integrity of an "offline installer"? I had a pretty rough time downloading an 8GB game (over 12 hours, SSL errors, interrupted download) and I'd like to confirm that it completed correctly and without interference.

Does GOG provide SHA / MD5 checksums (via the website / APIs / whatever), or anything similar?
This question / problem has been solved by Ganni1987image
high rated
I verify mine in this way:

1) Start by downloading a game.

2) Then Copy the download link which is something along the lines -

cdn-hw.gog.com/secure/offline/1421064427/1421064427/51283869651376372/9436/setup_sunless_sea_2.2.4.3141_%28213 25%29.exe?ttl=1529838133&hw_l=105&hw_token=c0bcbb.....
3) add the .xml after the .exe (or sh in case of Linux) - which would be something like this:

cdn-hw.gog.com/secure/offline/1421064427/1421064427/51283869651376372/9436/setup_sunless_sea_2.2.4.3141_%28213 25%29.exe.xml?ttl=1529838133&hw_l=105&hw_token=c0bcbb.....
4) The MD5 is the bolded part as below:

file name="setup_sunless_sea_2.2.4.3141_(21325).exe" available="1" notavailablemsg="" md5="33aa79aa20dd546144361b850037aa7c" chunks="29"
Post edited June 23, 2018 by Ganni1987
Excellent that's exactly what I was looking for, thank you.

With that I've confirmed that the download went through correctly, so I can start playing Obduction!
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Ganni1987: ...snip
Thank you for the info. It's very helpful.
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Ganni1987: I verify mine in this way:

1) Start by downloading a game.

2) Then Copy the download link which is something along the lines -

cdn-hw.gog.com/secure/offline/1421064427/1421064427/51283869651376372/9436/setup_sunless_sea_2.2.4.3141_%28213 25%29.exe?ttl=1529838133&hw_l=105&hw_token=c0bcbb.....
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Ganni1987: 3) add the .xml after the .exe (or sh in case of Linux) - which would be something like this:

cdn-hw.gog.com/secure/offline/1421064427/1421064427/51283869651376372/9436/setup_sunless_sea_2.2.4.3141_%28213 25%29.exe.xml?ttl=1529838133&hw_l=105&hw_token=c0bcbb.....
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Ganni1987: 4) The MD5 is the bolded part as below:

file name="setup_sunless_sea_2.2.4.3141_(21325).exe" available="1" notavailablemsg="" md5="33aa79aa20dd546144361b850037aa7c" chunks="29"
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Ganni1987:
pretty neat!