Sanctus_Library.ZIP is the file you get when you buy the Bundle, but this is not the file you have to install.
It has to be extracted into a folder, and there you will find multiple files:
Documentation.PDF – A pdf file containing shortcuts to important documentation pages
Sanctus Library License.PDF – A pdf file containing Sanctus Library License
Promo Coupon.PDF – A discount coupon to buy the full version of Sanctus Library
Sanctus-Library_Addon_v3.2.1.ZIP – The addon file you have to install – How to install the addon
sl_material_testing_scene_v1.0.BLEND – A Blend file prepared to test the different materials if needed
Alternative_Asset_Browser_format.ZIP – This is not required, only if you don’t want to install the addon and just use the assets with Blender’s Asset Browser
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