So:
Download 2.7.0.1 version and the 1.4.382 update(there's a shitton of tutorials on how to do that, Google a bit)->roughly 50 MBs
Download 2.7.1.2->roughly 1.2 GB
Download 2.7.1.3->only few MBs
Short summary of updating-download, extarct, copy/move to your game's folder.
Go to IW5M store, download and extarct DLCs, copy/move them to your game's folder.
Update your Tekno client/game to 2.7.1.4 and to 2.7.1.5.
Post back if you need any help.