Parallels really tries to constantly force people to upgrade every time there's a new version. They even pushed disfunction back to older versions - VMs which

Parallels really tries to constantly force people to upgrade every time there's a new version. They even pushed disfunction back to older versions - VMs which previously started unattended would be hung up with a "sales" window touting a new version, the VMs themselves wouldn't start, and Parallels had no way to fix the "issue" aside from the same bullshit we'd expect from outsourced IT ("Try uninstalling and reinstalling", et cetera). Upgrades often required reactivating Windows VMs, which is a huge pain in the ass. I wouldn't trust Parallels with shit.