If you have the data added to the application, then either use File > Save or File > Export. Save the contents to a USB flash drive, then re-download the necessary version from the application's page at Software Informer: http://easy-church-membership.software.informer.com/download/
Install the software and register it with your details (if needed) and reopen the files you have previously saved and that's it.
For all the issues regarding compatibility, right click the EXE file and go to Properties > Compatibility.