Here is what I mean: my folder has no MZ templates, only MV.
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Did you purchase CGC DLC for MV or MZ? On Steam, the DLCs are separated by engine. It looks like you did so for RPG Maker MV on here. When you started this thread you claimed to have purchased the DLC for MZ and we have given you configuration steps on that basis. Please accurately report what your setup is otherwise we will not be able to assist you.
Please send an email to myth.atelier@gmail.com with the Steam store receipt of your purchase and we can provide an itch key for the MZ version which contains the Blank Templates in question. We can continue troubleshooting once you have that available.