Troubleshoot and resolve A fatal error occurred while fetching the update errors.
Troubleshoot and resolve issues that affect multiple features immediately after an update.
Troubleshoot and resolve File could not be downloaded errors.
Troubleshoot and resolve GuardedForUpdate errors.
When you update WHMCS, the system will attempt to delete unused legacy modules.
Troubleshoot and resolve Failed to remove legacy modules errors.
If you use custom themes or templates, you will need to update them for any changes in new WHMCS versions.