How to get version 0.12.11.13725?

You don't - if you did not backup required version there is no coming back, wait for next update

Also, if you want to use BE builds - you should be knowing what you are doing yourself, it is explicitly stated:

Quote

Unstable dev builds. Please use normal builds unless you know what you're doing.

THIS IS A BLEEDING EDGE BUILD, USE AT YOUR OWN RISK

NO SUPPORT IS PROVIDED FOR THESE BUILDS.