Hi,
If the WPS Office installer doesn't appear, reinstall it and restart your PC.
How to Uninstall: https://www.wps.com/blog/how-to-uninstall-wps-office-pcandmacandmobile/
Alternatively, download the portable version of Revo Uninstaller (it's free). When you open it, wait for it to load the list of programs, select WPS Office, and uninstall it. Wait for the uninstaller to open.
After uninstalling, click "Scan" in Revo Uninstaller and wait for the process to finish. Then click "Select all and delete," and repeat the same procedure, selecting all and deleting.
Open the command prompt (admin) and run the commands: sfc /scannow and dism /online /cleanup-image /restorehealth. Wait for the process to finish and restart your computer.
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Thanks