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: Clicking the link will open the App Store. Click Get ; this will open the Software Update pane in System Preferences.

: Confirm the download. Once finished, the file "Install macOS Catalina.app" (roughly 4.8 GB to 8 GB) will be saved in your Applications folder. download catalina 10157 full installer high quality

Or check the InstallAssistant.pkg signature: : Clicking the link will open the App Store

softwareupdate --fetch-full-installer --full-installer-version 10.15.7 Combo Update download catalina 10157 full installer high quality

: Once the download is complete, the file named Install macOS Catalina will be located in your Applications folder. I need to download the macOS 10.15 - Apple Communities