Installing for activeCollab 3 Modules
Start by uploading the module files
You’ll be uploading a single folder to the new Custom / Modules folder in your activeCollab directory (shown here)
Go to Administration
Find the Modules area in Admin
Click to install your module
activeCollab will continue the install process
Your Module is installed and ready to go!
Now a couple steps to save you some headaches! Clear the AC3 cache and templates using Admin Tools
And last but not least — Clear your browser cache.
Each browser is different, if you aren’t familiar with the process — Google is your friend but here is a helpful resource: http://www.wikihow.com/Clear-Your-Browser’s-Cache
Most browsers will also clear the page cache using CTRL + F5 a few times to force a refresh.