Here's one way. TS 10 is around 8 GB, and TS 12 is about 10 GB. So, get two 16 GB thumbdrives, or SD cards, and install one version to each. Alternatively, on my present computer, I have the four versions of TRS / TS that I own, each in their own subfolder, in the folder N3V. The each work fine, and I have, at times, had more than one open at once (though not necessarily for the purpose or intent of running or creating routes.
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