MTU changes the registratin numbers on major program versions like, 3.0, 4.0 ect... This is because they make major changes to the porgams as they grow. The upgrade you made on Micro Studio was to one of these versions so it has a new number. (Your old number still workks for the earlier versin of Micro Studio.)
The Hoster upgrade does NOT require a new number so install 3.319 then run the upgrade to 3.321. This should get you going.
Jim
