If you prefer a graphical interface, you can access the hidden Mac App Store repository:
A: Yes. If you’re upgrading from macOS Sierra or High Sierra (HFS+ formatted), the Catalina installer automatically converts the drive to APFS without data loss.
Official Methods to Download the macOS 10.15.7 Full Installer
If you want to create a bootable installer for macOS Catalina 10.15.7, you can use the following steps:
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7.1 Creating a Bootable Installer
If you are already running 10.15.x and just need to reach 10.15.7, download the from the official Apple Support website.
: Must be running OS X 10.9 Mavericks or later to upgrade directly. How to Download and Install the Update
Apple has released macOS Catalina 10.15.7, the latest update to its operating system for Macs. This update brings several improvements, bug fixes, and security patches to enhance the overall user experience.