That's what I was thinking. I tried downloading it about 5 times, same problem each time. Tried it on another PC (not the one I intend to use for CAD) and it installed fine first try.I would download a new install file and retry it. The "cab file missing or corrupted" makes it sound like the download didn't go as planned.
No older version. Fresh Win10 install with latest updateIf you are upgrading the CAD PC from a prior version then I would release the license and completely remove (uninstall) the old version. Then do a Restart before installing the new version.