Please unpublish the following plugins:
- Installer - Admin Tools Professional
- Installer - Akeeba Backup Professional
- Installer - Akeeba Ticket System Professional
Then try installing the new versions of our extensions which had previously failed. It should now work.
Please let me know if that works for you.
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!