I've attempted to install the "User" add-on to a EE3.0.5 site. I have the latest version of User. I've followed these instruction:
Within the /system/user/addons/ directory, copy the user folder into your sites ./system/user/addons/ directory.
Within the /themes/user/ directory, copy the user folder into your sites ./themes/user/ directory.
Go to the Add-On Manager area in the ExpressionEngine control panel, scroll to down to the Third Party Add-Ons section, and find User in the list, and click Install.
But the User add on doesn't show up in the list. I refreshed my CP page, but still no luck. I double checked the user theme and addons folder locations and we're good. I refreshed the page again but still no User in the list. The permissions for both user folders is 755 (which I assume is correct). What do I do now?