lHi Raymond,
Just out of curiousity have you had a look around on your hard drive to see where the downloaded magazine files are located ?
If you can find the files and try to open them windows will either do so or say it is unable to do so , sometimes it will offer to check online to find a programme that will open them .
it could be a simple thing like the newer version of the app has had its link or association with the old files broken so it doesn't know they are on your hard drive , if you can find the files maybe a rigth click and look for open with … And give that a try .
Provided you stay out of the registry files and don't delete or format anything there is little harm you can do .
Just a thought .
Ian