UUID UUIDs and Modpack Servers on 1.6.4

[X_Log]

Hello, i want to know if there is a way to make a 1.6.4 Modpack Server more stable. I just recognized that a same player with a different name is not recoqnized by PEX. Can i upate PEX to 1.21? I cant update my modpack since there are mods which are not updated yet. Does anyone have found for a solution in how to fix such stuff?

 

Thanks in advance.

[The_Doctors_Life]

code your own plugin that makes pex UUID compatible/upgrade your modpack are the only ways I have found so far.