Blender 3.0 and higherInstall BlenderKit to the newest version of Blender.
Go to preferences and, then open Add-ons.
Click on Install and find blenderkit-18.104.22.168920.zip in your Downloads folder.
BlenderKit will appear in the add-ons list.
Click on checkbox to enable BlenderKit.
Blender 2.80 - 2.93
BlenderKit is preinstalled in Blender 2.80 - 2.93 so you can activate it easily.
Go to preferences, then open Add-ons.
Insert BlenderKit in the search box and check 3D View: BlenderKit asset library.
Create an account and activate by pressing Login directly in BlenderKit settings or Profile tab in BlenderKit panel.