Multikey (Shape Keys Made Easy)
The usual cause is that you need to have at least one shape key for each object in the collection. In other words, each mesh in the collection needs to have a "Basis" (the name doesn't matter) shape key.
A. Make sure it's part of the collection. B. make sure the shape keys have exactly the same names, they are case-sensitive.
MultiKey can be installed like any other add-on: just go to Preferences > Addons > Install and choose the downloaded .py file. You may need to restart Blender.
MultiKey works with all rendering engines, including Cycles and Eevee.
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