I'm afraid you will find that 5.2 is out of support now. The rule of thumb
that PTC applies is that a previous release will only be supported for 18
months after its successor release comes out.
Eg. Arbortext 5.3 was released December 28, 2006. That means 5.2 would have
run out of active support mid-2008.
The product calender shows Arbortext 5.4 was released June 24, 2009. PTC is
making the call that regular maintenance releases for 5.3 will consequently
be discontinued from Feb 1, 2011 after M220 is released. PTC support will
still keep taking 5.3-related support calls until August 1st 2011, after
which time you may be on your own?
(In reality, I've found PTC support to be helpful even where older software
is concerned, but you would be SOL for a software patch. I certainly
wouldn't want to stake my business on unsupported software?)