The latest new version will coexist with old. However, once you open yourydata file in new version in read-write mode the file becomes unreadable in old version because file format has been changed to improve security. New version will prompt to open old file in read only mode by default to prevent accidental old data file upgrade.
If I continue to use and maintain the old version for some time, can the new version be forced to read the old pwa file....on demand?
Another words, will the new version only read the old data file once, upon install? I want the new version to read old ver data file many times as I play with the new version....manually updating the new version on demand.