Alex --
Try this (a shot in the dark).
I am assuming that even though you have no tools that you can run Check For Updates from the Thor menu pad.
If this is so, first do the following: In the folder Thor\Tools\Procs you will find thor_proc_downloadandinstallupdates.prg.
Open it up and put a stop at the beginning of the procedure "SelectUpdates".
Then run Check For Updates. It should stop there (eventually). Step thru the code ... you will see a call to the form (the one that isn't appearing). I am wondering if the veriable lcFormFileName is empty at that point.