You made a one-time purchase, which doesn't expire. Upgrades (often just maintenance issues) are free for six-months. Thereafter, a fee is charged.
There's no mandate to update, and you can go here to download any version. Ignore virus warnings.
What version # was being used at time of purchase and what was the glitch? Try other releases within the free update grace period and see if it's fixed.
If not, come back here with specifics on the problem.