Closing this ticket as duplicate.
If anyone bumps on this ticket: upgrade to ATS 5.2.2 or later. This was a known issue on ATS 5.2.0. If you did and the issue wasn't fixed, please download the latest ATS version directly from our site's Download page and install it twice in a row, without uninstalling ATS in between. This will address a sporadic problem with Joomla not copying all files when installing an update.
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!