Need Help Pls

[Novacane]

I get this but I don't know how to fix it, could you help me what should I do step by step please, thanks

[Leatherface]

Try this 

 

Or look here  https://fearless-assassins.com/search/?q=protocol mismatch&quick=1

[rMks]

Hello,

 

this is what i found on forum:

 

(most easy solution should be save etkey and your files - uninstall and install from fresh / ideal ET legacy)

 

• - Protocol Mismatch Between Client and server.The server is trying to join an incompatible version of the game.

 

Solutions:

 

• 1 / Either you do not have the right version of a mod (which must be downloaded and installed, by doing a / cl_allowdownload 1 on the server itself for example) 
  2 / Either you do not have the correct patch of ET (if you are in 2.60b to pass 2.60, just install the patch 2.60 above or use one of many patch selector).It stuck for example if you install Etpro 3.2.6 with only the ET 2.60 patch. In this case, you have to patch ET in 2.60b.

[-=HipKat=-]

You're using a 64 bit client on a 32 bit server