I'm unable to install Parallels 10 Desktop on my 2020 iMac running BigSur 11.6.4. Problem ID 15380. I tried everything in article https://kb.parallels.com/114703. Mac user IDs are okay (none are 0). Years ago I ran Parallels 10 on my Mac Pro. Haven't run Parallels 10 since then. I want to install Parallels 10 on my iMac so I can buy an upgrade to Parallels 17. When run the Parallels 10 install pkg on disk image ParallelsDesktop-10.0.1-27695.dmg, I get Problem ID 15380. But the install says it found an existing Parallels Desktop on my iMac -- that's weird! Is there an uninstall tool I can run to be sure there no extraneous files? I used a 3rd party utility to search for Parallels files, but it found none. Any suggestions how to proceed? Thanks!