Since July 2026 if uploadShield is enabled in AdminTools you may not be able to install extensions/upload client plugins.
Read how to configure AdminTools and YourSites to avoid this problem.
We love every single one of our users, without you YourSites simply couldn't happen! So we would love a review at the Joomla! JED so we can let others know about us too, please take a minute to write a review:
https://extensions.joomla.org/extension/yoursites-manager/
If you feel you have something negative to say, we would implore you to speak to us first, as we really really don't want anyone to be unhappy!