Hi,
I hope i understood your question..so here is the answer:
Controller of 200 can be upgrade , But up to version 5.X.
(You will not be able to install version 6.0.X or 6.1.X) - upgrading process via TFTP is recommended. (but there are also other methods)
TIP: flashbackup | and also save your config locally before doing an AOS upgrade.
Hope that clarify this issue for u.
Replay if u need more info.
For downloading a new version of ArubaOS - u should contact your partner or log into the Partner/Support site.
Me