Hi there,
The program name is not important, the version number is.
If both programs are the same version number , you can open the files developed with Premium with the Professional program and vice versa.
If they are not the same version number, then, they follow the Punch compatibility rule => the compatibility works following the ascendant version number. This means that the old files are compatible with new versions but this doesn't work backwards.
Therefore, (for example) a file elaborated with V18 can be opened with V19, but if you save the file with V19 it will not open with V18.
Patricia G. / Forum Moderator
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