A new version of Topo vertex maps is in the works (2024).

see : https://c4d.freshdesk.com/en/support/solutions/articles/4000202166-topo-vertex-maps-2

For the the old version .....

Please read this general plugin install faq...

In general, on MAC, for R15 it is best to install any plugin to the user/plugins folder.

on a PC, or pre R15 MAC,  you can install to user/plugins or APP/plugins , it does not really matter which.

Topo Maps contains 2 custom tags, and these can be found in the standard tag list.