You revert to the free version (ads return, and advanced PDF tools lock). You will not lose your files.

Searching for "free" product keys online is risky. Most keys shared on forums are either expired or bundled with malware. Instead, use these official methods:

: You can unlock all premium features for 30 days without a credit card by simply creating an account on the WPS Office official site Business/Enterprise Lifetime Keys

To help you get the exact setup you need, could you tell me:

Instead of searching for "free" keys on shady websites—which often carry security risks—consider these legitimate and often free methods: