Hi Mojca,
If you have not already installed the Creative Cloud desktop app, please download and install it from https://www.adobe.com/creativecloud/desktop-app.html
1. Please Open the CC Desktop App, then please log into https://creative.adobe.com/addons/my_addons.
2. Then click on ‘Remove’, then ‘Install’. Please wait a few moments, then check the ‘Activity Stream' in the CC Desktop App, and confirm if it states that installation was successful, or failed?
3. If it failed, please provide us with the exact error message and its screenshot.
4. If it says successful, please read the ‘Where to Find it’ tab on the add-on homepage (link above) which will tell you where you can find the product after it has been installed.
5. Also please make sure that file sync is on in CC app and you have logged in with the same adobe id (from which the add-on was purchased) in CC desktop app and https://creative.adobe.com/addons/my_addons
You can try this with free add-ons available on our portal.
For manual installation of your product you can follow steps (You need to have the ZXP of the product):
1. http://install.anastasiy.com/ go to this extension manager to install or
Follow the link in order to install your ZXP file for your add-on by using ExMan Command Line Tool
Hope this will help. Thanks!
Regards,
Adobe Exchange Vetting