Your copy keeps working, permanently and in full. It is not time-limited, it will not ask you to reactivate anything, and it does not need to reach a server to keep running. The licence key you were sent is no longer checked by anything and you can discard it.
Memrith becoming free does not entitle you to a refund of what you paid, and it does not take anything away from you either. Every feature you paid for is still there, and every feature added since is included.
Memrith was sold for $9.99 with a 60-day money-back guarantee, processed through Polar as merchant of record. If you purchased within the last 60 days and want a refund, that guarantee still stands and you should contact Polar directly using the receipt they emailed you — they hold the transaction, and a refund does not depend on me.
Memrith is no longer for sale, there is no checkout, and no money changes hands. The software costs nothing and the source is published under the MIT licence. Your only ongoing cost is what your own AI provider charges you for your own API usage, which is billed by them and has never flowed through Memrith.
Nothing on this page limits refund or consumer-protection rights you have under the law where you live. Those rights apply to the purchase you actually made, on the terms that were in force at the time.