My minecraft launcher I will ether not load or will load the game put will not get pass 80% on the start up screen. I have tried to Uninstall the launcher and even deleted all of the minecraft files. This monring it was work just fine but was a bit laggy. I hope that you can fix this problem and get back my one minecraft world. 
this is what it in the output log PLEASE HELP
19:51:13.540
Preparing to launch minecraft client for 1.15.2
19:51:13.542
Prepared asset index
19:51:13.565
Have 2130 total files to check or download
19:51:13.569
Waiting for 2130 futures
19:51:13.745
Checking installations.
19:51:13.746
Minecraft client 1.15.2 is ready to start.
19:51:13.746
Starting!
19:51:13.746
Nothing to download!
19:51:13.746
Extracting 8 files!
19:51:14.442
Using default game log configuration client-1.12.xml (outputs XML)
19:51:14.442
Installing versions!
19:51:15.859
Setting user: Pilotofdeath