=> Download and unzip the respective extension zip and create Ecomfit(vendor) and Tracking(module) name folder inside your magento2folder/app/code/ directory and then move all module's files into magento root directory Magento2folder/app/code/Ecomfit/Tracking/ folder.

Install with Composer as you go

Specify the version of the module you need, and go.

composer require ecomfitteam/ecomfit

Run following command via terminal from magento root directory

 $ php bin/magento setup:upgrade

=> Flush the cache and reindex all.

now module is properly installed