Hi,
I am getting this error message.
The current installer you are using is outdated. Please download the new 5.2.1 installer from https://stackideas.com/dashboard and install it via Extensions Manager
I have downloaded the package and have tried to install it manually via Extensions Manager. The error still shows. Also I have cleared cache - but the error still persists.
As you have solved this issue before for another user please explain what I need to do to solve this problem by myself.
Thanks and regards,
Uwe