Will I be charged monthly for having the deluxe edition? Or is it only charged at the time of use. How do I down grade to avoid further charges?

[SteamTrain]

No...just when you e-file (or try to print before efiling)

The only charge, beyond what you pay now, is if you come back later and include a new state that is not in your file when you pay now.  ..or perhaps if you amend later and have to upgrade to a higher version because of what your amendment contains.

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Once 2018 is shut down (usually late October) and next year's tax software is ready to star tin with it/.... you will not be charged there until you either e-file it in 2020...or attempt to print a copy of your file...whichever you do first.