UK Dataset disapperaed

yesterday i was looking at applying family/parts to the 3d objects on the project i was working on

these were the supplied M5;M6;M7 mechanical ones supplied with the software

when i got around to it, the family/parts were replaced with the US dataset familiy and parts together with the dgnlib files.

the same thing has also happened to my personal computer

how do i get it back to where it was?