Can version 7.0 be upgraded to 7.1 or will ver9 work on 7.1?

[lundrat]

I require 7.1 for doing work at home on an existing 7.1 document, the company I work for is still using 7.1 and has no plans to upgrade to 9 at this point in time.

I can purchase a new unopened box with FM version 7.0  to use at home. It is as far as I can determine a legitimate FM product.

Or can it be upgraded to ver 9 and work on v7.1 documents without changing them to ver 9?

Thanks to anyone who can answer this somewhat convoluted question

[MichaelKazlow]

It is unlikely you can find a legitimate version of 7.0 available. According to the Adobe store version 7.0 is upgradable to version 9.

Version 9 cannot work on version 7.1 files. It will  upgrade them to version 9, but you can save to MIF which can be opened in version 7.1

[Jeff_Coatsworth]

But if you use any Unicode characters (supported in 9), they won't be picked up properly in 7.1.