"Program aborted: user not installed"
Sorry, hadda do it..... 🙃
Anyhoo, the .NET Framework issue is an old, very weird FAQ that, despite how easy it is to do, confuses the heck out of many who have unlucky chance to run into this!
1: Installing .NET Framework 2.0 is easy - jus type "Windows Features" in the search window, let it load, and click ".NET Framework 3.0/3.5 (includes 2.0)" or some variation of that specific version, as such. Let it install and update as necessary.
2: Specific versions of .NET Framework are independent of each other, not backward compatible, and you can have multiple versions installed , if you want/need. They will not conflict!
3: To reiterate, .NET Framework 8.0 won't run .NET Framework 2.0 software, so you need to install .NET Framework 2.0. Fortunately, the needed software is preinstalled, just needs to be activated in "Windows Features". Sentinel's installer doesn't make this clear. Sounds counter-intuitive, but it remains compatible to a variety of Windows versions and installations. And yes, it's available even in Windows 11. I don't think it'll disappear anytime soon, and if it does, from the Windows Features setup, I'm sure someone will set up a backwards-compatible installation method, somehow.
4: Yes, it is a Sentinel FAQ! With emphasis on the "Frequently"! 😁