Sorry to bother you but I'm getting the same error message even after the fix. Would you mind having one more look for me please?
Now you have a different problem. In the first EXE.XML you posted, I haven't noticed that, in addition to having the last line truncated, you were also missing the </Launch.Addon> closing Tag for the Fenix section.
However, in the last EXE.XML you posted, it's even worse, because you are now missing the </Launch.Addon> for FSUIPC7 ( which you had before ). Try to be more careful when doing edits, here's a fixed version but please, don't use the FSDT forum as a general "XML cleanup service", because it this becomes an habit, nobody will get any support, since I'll spend all my time fixing corrupted XMLs.
There's a EASY way to verify if you EXE.XML is legal, and is to open it with Internet Explorer. If there are any syntax errors, it will say that.