Well... this is not something you should be using unless you have a specific reason. Currently, all GMAT Prep tests are administered online.
These older versions are old.... they do not have section order and they still have the longer version of the test. The Version 2 and current online GMAT prep share the question database down to the "T" and you won't get any new questions out of the version 2. Version 1 and PowerPrep on the other hand, did have other questions but there is overlap so that's a mixed bag.... the only reason I can see using these if you are offline or GMAC Offline and you just need to take a practice test but that's not a common scenario. But I fixed the links. They were missing the "s" as in https
P.S. Unfortunately you cannot use EP1 or EP2 anymore; those codes need to be activated online and GMAC tookdown the authentication servers a few years ago when the launched the online tests... so here we are.