# Problem Installing Add-Ons in Blender 2.91

When I try to install some add-on in Blender 2.91 via the usual method, Blender immediately confirms that it loaded the add-on successfully via the blue tag that appears at the bottom of the screen.

The un-zipped add-on also appears in Roaming>Blender>Foundation>Blender>2.91>scripts>addons>some_addon

Yet, it may take a few minutes until I see the activate tick box, if I see it at all. Windows 10 Pro and all software drivers are up to date. I’ve uninstalled then reinstalled Blender 2.91 several times. No error message appears.

• Activating the add-on executes it's register function. Depending on what the add-on does, this may take a moment to complete. Without knowing what specific add-on is slow, we can't tell you if this is unusual. Dec 10 '20 at 23:08