The free version displays ads, and some advanced features (like merging PDFs or advanced formatting tools) are locked behind the premium paywall. However, for 90% of daily office work, the free version is sufficient.
Instead of using a random key, Elena went to the official WPS Office website. She clicked on and watched the installer run again. Then she noticed a tiny link at the bottom of the pop-up that she had missed before: "Continue using Free Version with ads." product key wps office free