- Plesk Onyx
In an attempt to activate Plesk license via Plesk > Tools & Settings > License Management > Install Key > Enter an activation code the following error appears:
PLESK_ERROR: Automatic upgrade for this license is not possible. Please contact your reseller. (Error code: 2)
The Plesk license is tried to be activated by using an activation code for an additional Plesk license.
Use the activation code for the main Plesk license.
If the activation code is unknown - contact Licensing and Purchase support to get it.