Hi all.

It has come under my attention that while using the offline installers of the game, the setup is unpacking files in a temporary file in the Windows installation partition and afterwards copying them in the target location partition.

As you might have noticed I mentioned "partitions", since my hard drive is partitioned in multiple chunks.

In my case, the C: partition is where Windows reside. It has a maximum partition size of 50GB and its majority is used up by the OS files.
Now, the setup trying to unpack installation files in an almost full partition, before copying them in the target partition, let's say D:, of 300GBs of free space, leads to installation failure.

If you have come across this issue please leave a comment.
I kindly request for GOG.com team to fix this issue with the offline installation files ASAP.

Cheers.

The real critical issue here is only having a hard drive and not an SSD as a system drive, followed by the arguably critical issue of only having 50 GB for the OS. A Windows 10 install is going to eat up that eventually.

Anywho, you can edit where the OS stores temp files. I haven't done this in a few years, and I don't know whether this works with the GoG offline installers, but it's worth a try if you're short on space on the OS partition.

Right-click on the PC icon on the desktop, click on Properties, and go to "Advanced system settings".
Should also be able to find the same page by typing in "system" in Windows search.

Click on "Environment Variables..."

Edit the TEMP and TMP listings to wherever you got a proper amount of disk space.

Save and exit, and restart the PC to make sure the changes take effect.