You’re using “spare” incorrectly. It means to avoid. “Spare the expense” means to avoid having to pay for the license. Which seems to be the opposite of what you are saying.

“Spare the money” is probably what you mean. That is to part with the money, to avoid having it, for example by spending it. Or by giving it away - As in “can you spare a dime.” The is the inverse of sparing the expense, just as an expense is the inverse of money.