How do I install \components\packagetemplates" into the IDE?
Ive got a clean install of 2.0.12
I understood you have it installed already. How could you test it otherwise?
After replacing the packagetemplates directory, just rebuild the IDE.
When you get a compilation error, first try a clean build.
If it does not help, then you must build the trunk sources which I strongly recommend anyways.
It is super easy. FPC being installed, just run "make" (*) and then start lazarus.exe from its location. No installation is needed.
I am actually surprised you didn't try it during your 8+ years at this forum.
(*) Delphi comes with its own incompatible "make". You must delete or rename it if you have Delphi.