[Issue 20489] Installer deleting files after install

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20489

--- Comment #2 from Simen Kjaeraas <simen.kjaras at gmail.com> ---
Win10 1903, so that shouldn't be it. Could be work's overzealous antivirus or
somesuch, I guess. Tested it both upgrading from 2.089.0 and just reinstalling
2.090.0 over the botched 2.090.0 install I ended up with. In total I tried it 7
or 8 times, and managed to recreate the issue 4 or 5 times.

I tried it again on a different computer today (but still a work machine, so
could still be their antivirus - I'll be trying it at home tomorrow), and after
seven installs didn't manage to get it to remove every single file even once,
but had partial installs five times. I tried this with both 2.090.0 and 2.078.0
with identical results.

--