Downloaded two times the offline installer (on two different machines).
Keeps saying there is a corrupt memory reference during installation.

Disable Windows Defender, still got the error.
Is the offline installer working with someone else on W10 x64?

Working fine here on Windows 10 x64 1903. Did you use the "check file integrity" option inside the installer before installing?

I just tried it as well, no issues on my end, Win 10x64 (newest version) as well.
Could it be about the folder you are trying to install to or where the setup files are loacted while extracting?

Tried the installer on the first pc where i downloaded it (hadn't the chance to try it), here the installer works.
This is the version i (re-)downloaded on the second pc where i thought it was corrupted.
Must be something with the Windows OS then i guess.
Never had any other problems before when installing gog games on both pc's.

On linux using wine. First gog download. Everything is in the same folder, but its asking for a part 10 of bioshock infinite. All was downloaded through browser, and is right size. Im staring at part 10, however its saying not there.