You’ll need to integrate that git change into your local code repository and rebuild the engine. That will be a fair amount of work if you’re not used to git, or building UE4 from source yourself (and outside the scope of this forum topic).
If you don’t want to tackle that, you need to wait for an official release that contains the fix. In the meantime, you can try working around the problem by limiting yourself to UDIMs sheets along the U-axis. If you need to use the V-axis, I think you may be able to work around the bug with some additional material nodes. Try transforming your V texcoord like this in the material, before sampling from the UDIM:
v = (1.0 - floor(v)) + frac(v)