When I was trying to log in, there was a error 'Loadlibrary failed with error 193: %1 not a vaild Wins32 application'.

But i fixed it in Java executable. I changed it from 'C:\Program Files (x86)\Minecraft\runtime\jre-x64\1.8.0_51\bin\javaw.exe' to 'C:\Program Files (x86)\Java\jre1.8.0_201\bin\javaw.exe'.

However, when I was trying to log in, it crashed. So I opened the launch option to fix it again, and i realized that there is a problem in game directory that i couldn't fix.

In the game directory, it shows 'C:/' but not 'C:\'. Then I tried to change it to 'C:\'. However, it wasn't working. It just keep changing back again.

Then, I tried to download the old launcher of Minecraft to fix it. But there was a problem about the old launcher in Jave executable.

It shows'C:\Program Files\Java\jre1.8.0_201\bin\javaw.exe'. So i changed it to 'C:\Program Files (x86)\Java\jre1.8.0_201\bin\javaw.exe'.

Then, I opened Minecraft successfully. But when I was trying to use a client called 'Badlion Client', it just showed the error which I fixed at the  Java executable.