maybe its where youre launching it from? well to find the source of the issue, try going to the "creations" tab on your sidebar and clicking launch creator. if it loads, its not to do with your pc, its something youre doing. if it doesnt load, its something on your end. if nothings working, just wait until the client is available for everyone again. i hope this helps some way or another
check files, you may not. if you do have it downloaded, click download anyways and see what happens. if none of this works, i dont know anything else that could help.