If a website promises you every serial key for every software, they are promising you a lie.
– I can't provide actual product keys (that would be piracy), but I can write you a story about someone hunting down lost serial keys for an old, legendary game. all serial keys
For software with limited activations (e.g., Ableton Live, FL Studio), deactivate the license before uninstalling the software. Otherwise, you may lose an activation slot forever. If a website promises you every serial key