Settings dont save…

Hi, just trying to use the free version at the moment before upgrading shortly.
However, the settings dont save in admin…

I have the free version and the premium package digital store solution installed, both latest versions.

Example – in admin settings, if I go to premium package and make any changes, click save, it just spins but does not save.
Currently cannot use the plugin for selling downloads at all as its locked to $ and other default settings.