UBB.threads PHP Forum Software Community Forums UBB.threads Installation and Upgrade Support Folder question

I have UBB Threads 6.5.1.1
The upgrade instructions say not to copy the "cache_builders" folder but do copy the .php file in it to your current install.

I don't have "cache_builders" folder in 6.5.1.1 I have a folder named "ci_builders" is this the same and should I copy the .php files from "cache_builders" into "ci_builders" or some other location?

Thanks