We don’t have the manpower to support Windowx XP, sorry (Also, it’s not getting security updates anymore so it’s really not a good idea to use it).
There’s nothing on Tribler that’s incompatible with Windows XP, but the installer should be modified to bundle the right DLLs so it works there. If you are tech savvy enough, you could run it from source (https://github.com/Tribler/tribler).