After upgrading Plesk to Onyx 17.8, PHP 4 was no longer available for deletion in Plesk Installer. To uninstall PHP 4 on Plesk Onyx 17.8 follow the steps given below:
- Connect to a Plesk server via RDP.
- Start a command prompt as an Administrator and run the command
- msiexec /x {A8A9FE13-E0F6-4584-8F22-8E6E8AF4DFC3}<
- Click “Yes” in the confirmation window.
- Once the uninstallation is completed, in Plesk go to Tools & Settings > Server Components and click Refresh.