How to install
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Navigate to Blender Preferences -> Add-ons tab and select the dropdown.

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From the dropdown select the option “Install from Disk…”.

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Navigate to where you have downloaded the
.zipfile for the add-on. -
Select it and then click “Install from Disk”.

Once installed
All your add-ons from the sidebar will appear in Blender’s header.
If you have a lot of add-ons you can scroll on the header with the mouse wheel to go through them.