Hello Jodie, to help you with your problem ... start your computer and leave any program closed, just a regular startup.
On your computer search your maps/files for 'RuneScape' ...
After search results do show all its maps/files it could find delete all maps/files which were found with 'RuneScape'
Again on your computer search your maps/files for 'Jagex' ...
After search results do show all its maps/files it could find delete all maps/files which were found with 'Jagex'
After having done that your computer is cleaned from all maps/files that have anything to do with RuneScape and you should be able to do a clean install with Jagex's latest RuneScape-launcher.
If you are not sure, after having removed all related maps/files showing in 'RuneScape'/'Jagex' results you could restart your computer first before attempting to install a new launcher.
09-Nov-2022 08:14:28