In Manage add-ons, when trying to enable RefinedMobile it does not work.
This may be a conflict with another add-on being disabled, that RefinedMobile depends on. To see whether this is the case, follow these steps:
Go to Confluence administration > Manage Add-ons
Change to System add-ons
Scroll down the list and make sure that all the "Workbox" add-ons are enabled.
If these add-ons are not enabled, expand them and enabled them.
Try to enable RefinedMobile again.