hi I am getting the same issue. I was getting RuneScape crashing maybe 10 times a day so i uninstalled it and found a new launcher...which doesn't work. If i try launching RS, I get error "unfortunately RS could not start. please try uninstalling and reinstall etc etc. I ahve tried this 5 times now.
I ahve emptied my cache an tried restarting my laptop.
I have also tried the suggestion to launch standalone - get same response.
I am windows 11 and somewhat sad about this. i was just about to level up to 119 archy. as well :/
27-Feb-2023 21:02:33