Manually Upload the Plesk Extension
1. Download the latest Plesk extension from our website.
2. Open /usr/local/psa/admin/conf/panel.ini
for editing. If it doesn't exist, create it.
3. Add the following content, and save the file:
[ext-catalog] extensionUpload = true
4. In Plesk, navigate to Extensions > My Extensions, as seen in the screenshot below. Click the Upload Extension button, and upload the package that was downloaded in step 1