I' m afraid that the demo installation of NINA v1.0.8 is suffering the same issue. After trying to install the demo, the following error shows up:
Duplicate entry '700-4.0.3-2021-09-05' for key 'PRIMARY'
When re-clicking the different setup buttons, this error shows up:
The security token did not match. The request was aborted to prevent any security breach. Please try again.
Pressing CTRL+F5 (clearing cache) seams to solve the issue temporarly. At least it brings you to the next page: the admin login. But when you try to gain access as admin with your super user credentials, the next error appears:
Username and password do not match or you do not have an account yet.
Going to PHPMyAdmin > *.users > the list is completely empty. It seams that the demo doesn't create any admin user, even when you are requested to give a username and password.
Maybe the error is being caused due to the Joomla update v4.1.0 and Nina v1.0.8 was created under a prior Joomla version?
Any hint?
Thanks.