Opened the new launcher and hit run for minecraft version 1.11.2, and it started downloading the realms-1.10.13.jar file and then gave this error(BTW I don't use realms):
Unable to save download. realms-1.10.13.jar
Name: realms-1.10.13.jar
URL: https://libraries.minecraft.net/com/mojang/realms/1.10.13/realms-1.10.13.jar
Error details: Attempting to move successful download to C:/Users\user\AppData\Roaming\.minecraft\libraries\com/mojang/realms/1.10.13/realms-1.10.13.jar
The process cannot access the file because it is being used by another process
Filename on disk: cbb1-cd68-d7cd-968c
Path: C:\Users\user\AppData\Local\Temp\cbb1-cd68-d7cd-968c
Exists: file