Not sure about DesktopX 3 Pro, but.....
DesktopX 3.5 Pro will not allow anything scripted to run. It is a known bug which hasn't seen any attention. It's totally useless and shouldn't even be available.
You'll need a newer version and I don't see that available anymore.
I was fortunate enough to archive the 4.0 Beta of DesktopX Pro, which installs as 3.96. It doesn't seem to be in the store or in SDC.
It works pretty well.
I'd write an email to email@example.com
Then wait for a response other than the automated one.
If you respond before being contacted, you'll get moved to the back of the "line".