If you truly are using the Desktop software, deleting it for the one tax return doesn't affect the fact that you've already bought it....installed it...and it is now yours to use at-will
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IF you are still worried, then start a NEW tax return for the other person you are helping, and get far enough in to get the State tax return started.
Save that file (the state you don't need is now is a part of it) and then go back to your own to delete the state you don't need there..
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Again, I stress, this is only if you are using the Desktop/download software. IF you are preparing in a browser window...that is not the desktop software.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
