"The Error occured during file index read"

Hi, first time trying to install RumbleFighter and this error pops up when I launch RumbleLauncher.exe - what do I do?!

https://gyazo.com/f674f195491e213d0e91052ef1a17a54

 

This error usually occurs after an update, it’s when your computer has trouble downloading the new files from the update server.

If you have any antivirus software on your PC, disable it.
As well, try resetting your router & modem..

 

The error still displays - I've tried installing RumbleFighter on my current PC and my laptop; both displays this error!

 

@honglong2000 @xMrChow1
Okay,
Are you playing from a home network?
Do you have any antivirus software on your computer (Norton, AVG, etc)?
Do you have administrative rights on your computer?