Hi Daniele, welcome to the Community!
Have you already successfully installed the new .NET version? Are you still having issues after that?
If so, can you have a look at the logs and show us what you find? You can find them at C:\Users\<username>\AppData\Local\Atlassian\SourceTree\sourcetree.log.
Also, please let us know which version of Windows are you using.
Cheers!
Ana
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