Possible to run different versions of Storyline 360 simultaneously?

Unfortunately, I have one client who wants me to use the february 2021 version of SL because they haven't updated it organizationally yet, and another who wants me to use the latest version. I'm working for both clients during the same time period.

Any chance it's possible to download and use both versions of Storyline 360 concurrently (switch back and forth without reinstalling each time)? Are there any other workarounds you can suggest? Is it possible to "save as" an older version, for instance? 

If I have to choose to work in only one of these versions, is it best to work in the oldest one and then upgrade it at the end?

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