Go to “Admin”->”Extension”->”Local Install”, and upload .zip file to install. If ZenTao is customized and paid plug-in is installed, you have to install ioncube, please refer to http://www.zentao.pm/book/zentaopromanual/135.html Please note

1) A plug-in can be only installed once. If you installed it more than once, it could cause data conflict. Plug-in trial is 30 days, starting from the day it is downloaded.

2) You have to use the account you download trial to purchase the plug-in, or it might clear the existing data.