Troubleshoot and resolve A fatal error occurred while fetching the update errors.
Troubleshoot and resolve File could not be downloaded errors.
Troubleshoot and resolve Fatal error: The file was encoded by... errors.
When you update WHMCS, the system will attempt to delete unused legacy modules. This helps to prevent problems due to older PHP code.
If you use custom themes or templates, you will need to update them for any changes in new WHMCS versions.
Troubleshoot and resolve Check for Updates Failed errors.
Troubleshoot and resolve new versions not appearing after checking for updates.