Already install latest Microsoft .NET Framework 4.7.1 - Microsoft .NET Framework 4.7.2 - Microsoft .NET Framework 4.8
and reinstall GSX + Level 2 but when I start FSX I got this message (see attachmet) and GSX doesn't work.How do I fix this.
It's not clear from your message if installing .NET fixed the updater error or not. If the update cannot complete, it's normal you will have issues running the product.
If, instead, the updater works fine, then this error is caused by something else entirely, that doesn't have anything to do with the updater. In fact, usually running the updater a 2nd time, will fix it, because it's caused by Windows setting an automatically compatibility key in the registry that shouldn't be used, and the updater will clear it.