What solved the problem for me on Windows 7:
Turn Essentials off, so I could turn Defender ON.
Add Commander to Defender excluded
Run Defender scan, all clean
Turn Defender off.
?
Following DXLab online directions on how to load Commander, till couldn't get 5.87 to unzip, but saw that my Commander/install had it still from original install.
Ran 5.87 exe from there.
Started Launcher - 5.87 shows up now!
Upgraded to 14.5.5 via Launcher Config, all works.
I work in Internet security and I don't recommend anyone run an Internet connected PC with no AV, unless they are willing to continually do the logical equivalent of digital separation, washing their digital hands continually and not touching their digital faces....? I've helped many hams figure out to recover from malware trashing their PC - more often than the AV trashing the ham software, as it definitely seemed to do on this occasion.?
But, all risk decisions are individual - YMMV.
73 John K3TN
John K3TN