In general, a PV+ 7 with v10 firmware can run a Runtime (*.MER) application that was created for any older firmware version. ActiveX controls and KepServer drivers would be my principal concerns.
Have you tried moving the MER onto the terminal with an SD card or USB drive and just running it ?
Updating the FactoryTalk Linx (or maybe the whole FTView Studio installation ) to use the Upload/Download network utility, or de-compiling a *.MER from an old system, are separate considerations than "can my new terminal run this old project".