Can two copies of TT be on same computer? (Mac)

I’m staying with my elderly parents at their home, and I need to file my taxes. My parents also use TT. They have a Mac.

We are military, and will be using USAA’s free Online Deluxe. Can I use that while my dad uses the download version like he always does? I don’t think two copies can be downloaded onto the same computer, but I’m not sure how the online deluxe works, if it actually does have some downloaded files that might mess with his copy.

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