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How to Manually Upload the Plesk Extension
1. download the latest Plesk extension from here
2. edit file /usr/local/psa/admin/conf/panel.ini
, create it if not exists.
3. add following content:
[ext-catalog] extensionUpload = true
4. save the change , now navigate to Plesk extension ---> my extension , as screenshot , you will see an upload button, and upload the package downloaded in step 1