Question: how to install vqmod in opencart?
Answer: Backup or make a duplicate of your existing installed OpenCart files and folders in safe place.
Download the latest version of Vqmod from: ... 
Using FTP, upload the "vqmod" folder from the zip to the root of your opencart store. ... 
Goto http://www.yoursite.com/vqmod/install.
You should get a success message.