Attached is an upgrade guide that will take you thru the steps and the important considerations for the upgrade to the latest and exciting release of DevTest from Lisa 7.5.x. Keep in mind that the EOS for Lisa 7.5.x is mid- this year.
Here is the location of the PDF - How To - Upgrade DevTest 7.5.x To DevTest 9.1
Remember we now support in-place upgrade from 7.5.2 and 8.x to 9.x which means you can install in the same location as your prior release and you can also use you existing database which will be upgraded automatically for the 9.x release!!