can you log onto your magix account?
it is quite easy to do what you want there
I don't know of any worthwhile paid for program, and that includes adobe/illustrator, that does not require a login to switch, either from within the program or as is the case with magix, externally [unless you are using a really old version]
and to be fair, with xara you are actually allowed more than one install at the same time
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