256MB VRAM (1GB recommended for 4K editing and 3D titles).
If you are a commercial environment or enterprise user with a volume license, or if the automated App Store method fails to fetch the correct version, your best course of action is to contact Apple Support directly.
The following article provides a detailed guide on the legacy version of Apple's video editing software, Final Cut Pro 10.4.6, including its history, compatibility requirements, and the proper channels for accessing legacy software.
Whether you have Final Cut Pro on your Apple ID.