Installation:

Assuming you don't have any map mod installed, drag gta.dat and images.txt to common/data.
Drag "ct2" folder to /pc/data/maps.

Manual install:

Add these lines to GTA.dat:

IDE platform:/DATA/MAPS/CT2/CT2.IDE
IPL platform:/DATA/MAPS/CT2/CT2.IPL

To images.txt:

platformimg:/data/maps/ct2/ct2	0