Your question is not clear, plz describe it with more details !!!

Are you using any Version management tool like Source Safe? If so, u can just roll back to the version you require and get the latest version.

Dear All,
         I have 2 versions of the same application. now my framework is running the heigher version of the application. I would like to load and run the lower version of the application.
what should i do?

Advanced thanks for all.