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Please post the error message(s) as verbose as possible. Along with the error logging and debugging options in WHMCS, you can also check in your cPanel File Manager in your WHMCS installation for a PHP error file, or in cPanel Errors to view what might be happening. As for the /vendor/smarty folder, I believe it has to be from the 8.13 version and not ver 9.0 of WHMCS as they did get rid of the Smarty files and hooks in ver 9. They need to continue working with the out-dated modules/addons that aren't working with ver. 9. What other modules and addons are you using that might not be updated to work with ver 9.0 and interfering with the new version of WHMCS? For me it was ResellerClub-Mods and my Lagom Theme files.

Hi @davegeoghegan First, always backup (I use Softaculous) so you can easily restore when there is a problem like this last major update to ver 9.0. What a lifesaver! I turned on all the log errors and debug options in WHMCS and used ChatGPT to help me find the root of the update problem. For me it was ResellerClub-Mods addon & core modules and my custom theme. To successfully update to ver. 9.0 I had to wait for updated addon modules and theme template files. So keep the existing (older) WHMCS installation in tact until everything is updated to work together. (don't update yet). You will need to disable the auto-update in WHMCS. You can't turn it off really, so I call it disabling. Go to Utilities->Update WHMCS -> Configure Update Settings and select the option " Current Version - Restricts to maintenance updates for the currently installed version (#.#)". Note the temp path for the staging files in that window (/whmcs-backups). You can't just delete this info or give it a fake name as the system won't allow it. You will need to go to your hosting File Manager or use FTP to change the name of this folder so WHMCS doesn't automatically write the staging files to it -> something like /whmcs-backups_ will work. Once you have updated versions of the addon modules/theme templates/etc, you should test it all in a staging environment if you can. Before updating, deactivate the RC modules in WHMCS/Addon Modules (follow their updating instructions for this one, you might have to delete the modules in /modules/addons), delete the RC-Mods files in the /includes/hooks file (cPanel), then run the WHMCS update to ver 9. Once done, update/re-install the RC-Mods (and custom themes) and check that it all works together. I've tried to remember everything I did to update successfully. If you still have trouble, post again and let's see if we can get you up to date. 🙂

@Rayyan What error are you getting after disabling/renaming the hooks file? What else is wrong? As for my site, I turned off updates in Softaculous - Thank you @Mytihostand @RadWebHosting - That was the problem with the auto updating. I won't update until the RC-Mods core management is updated for WHMCS ver9. And even then, I'm updating in a staging site first to make sure it all works first.

My live WHMCS installation automatically updated to 9.0 and the site went down with a Critical Error: Luckily I have site monitoring on so I was notified by email immediately! I rolled back to ver 8.13.1 using a softaculous backup/restore, and set up a dev site to troubleshoot. I worked with ChatGPT to find the files causing this. I use the Lagom 2 Client Theme and Website Theme, and ResellerClub-Mods addon modules, including the Core Management Console ver. 4. --> The hooks in this module include older Smarty hooks PHP 8.2.29 + ionCube 15.0.0 are the currently acceptable versions. Smarty also updated to Smarty is v4.5.3 which is needed for the new 9.0version. We did a backtrace and found: I disabled the resellerclubmods_core/hooks.php by adding an _ at the end. The dev site was restored but that means I can't sell my products! I have a ticket in to ResellerClub-Mods to udpate their core management console ver 4, as the update from 1/9/26 doesn't address the issue. To set up my dev site, I had WHMCS reissue my dev license, and I will need RS Studios to reissued my Lagom 2 theme dev license as I have made changes since it was issued. I can't see if the theme is correct after the update without a fresh dev license. In the meantime, my live site keeps automatically updating to 9.0 and I have to keep rolling it back! WHMCS hasn't provided a way to turn off the auto updates that works (changing the temp update file path location doesn't work if the file path isn't valid, and turning off Update WHMCS in Admin Roles doesn't work either - it just takes that option off the board.) Ugh. Has anyone else run into this problem? I just wanted to put this out there in case someone else is having this problem. I will update with any working solution when I have it. It's already been 4 days, so I'm hoping it happens soon.