I am encountering an error while installing Arcanum Multiverse.
I get

Error: Error while unpacking archive: "dat2.arc" [-1]

and the installation stops there.

Has anyone else encountered this problem and if so, were you able to fix it? Or does anyone have any suggestions on what I'm doing wrong?

I'm on a Windows 10 PC.

Thanks in advance for any help you may be able to provide.

Greetings!

I'm unsure what version you used or how you obtained it, but I found 1.4's download links (available in the comments of this guide: https://steamcommunity.com/sharedfiles/filedetails/?id=760410053 ) to work.