Blessed Windows 10 for not making any notifications of what was going on.
I found the SoundPackager 10_9.9_beta.exe in my downloads folder and manually tried installing. It failed, but actually gave a better notification (Could not create a folder). I remember this happening when I first installed some other of your programs. Went into Windows Virus settings, History, and saw that they were quietly blocking your installer.
So I 'allowed' and tried again. Same error. Every time the installer would start, it would create a different-named installer, which I would have to allow (after it failed). I ended up disabling Windows Ransomware protection "Controlled folder access", and installing by itself, then re-enabling it. I expect I'll have to monitor the history for a while and 'allow' the fully-installed program to be able to modify system folders.