- Plesk 12.5 for Linux
Install or Upgrade Product button in Tools & Settings > Updates and Upgrades is greyed out.
plesk installerdoes not suggest Plesk Onyx for upgrade.
Operation system has a 32-bit architecture:
# uname -m
Plesk Onyx does not support a 32-bit operation system.
Plesk Onyx supports only operation systems with a 64-bit architecture. Check the Software requirenments for more information.
The only possible way is to upgrade by migration. Check the Migration Guide for further clarifications.