Click this link and follow the directions;
http://www.mtu.com/vbulletin/showthr...p?threadid=259 to get your new serial number and username if you don't already have Microstudio V2.103. We had to change the serial number, but V2.200 uses the same serial number as V2.103.
Also, make very sure you are entering the email and serial number that you were sent in the "Download Microstudio" email. If you don't enter these codes correctly (read the instructions!), it will not install.