Your original link will not work due to a new installation procedure.
Also, those qualified for a free upgrade to Microstudio 2.506 have already been notified via email.
All others ( those having purchased 2.400 over six months ago) need to go to the MTU store and purchase the 2.506 upgrade for $15.00.
If you do not have a Plextor 52X burner, and/or your video card requires that you use 8bit resolution, then you have no need to change at this time.
When it becomes practical to upgrade ( which could be now if you have the 52X burner), you will start fresh regarding the number of downloads available, which are based on attempts. That is why download accellerator programs are discouraged. They can eat up the available downloads in one attempt, and mess up the download.
Continue to back up new downloads, smart move.
Hope this helps,
George