oh yeah it also says the file is corrupted
Viewing post in Caliross, The Shapeshifter's Legacy comments
I downloaded the files and installed the game just to make sure, so at least the problem shouldn't be with the uploaded files (windows defender did warn me because of the "unknown origins" of the file, but there is the option to install the game anyway afterward).
If the antivirus is flagging the game, it could also corrupt the download, so make sure to disable it before you start the download, install the game, and only then re-enable the antivirus.