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: Visit the macOS Catalina page in the Mac App Store and click Get . This will open System Preferences/Settings to download the installer.

Stop suffering from a bloated, slow macOS upgrade. Perform a with Catalina 10.15, and watch your older Mac fly again.

Open your web browser and click this official link: Get macOS Catalina on the Mac App Store. Click or View in Mac App Store . The Software Update panel in System Preferences will open.

Paste the following string exactly as written and press :

Select your internal hard drive from the list (this is typically named or Apple SSD ). Click the Erase button located in the top menu bar. Set the drive properties to the following specifications: Name: Macintosh HD : Visit the macOS Catalina page in the

, type your admin password, and wait for the process to finish. 3. Perform the Clean Installation

Click the link for . This will automatically redirect you to the Mac App Store. Click Get or Download .

hdiutil create -o /tmp/Catalina -size 8500m -volname Catalina -layout SPUD -fs HFS+J Use code with caution. Mount the newly created blank image to your file system:

With your bootable USB drive successfully flashed, you are ready to perform the clean install. Step 1: Boot into the Installer Drive Shut down your target Mac completely. Insert your bootable macOS Catalina USB drive. Perform a with Catalina 10

Move the finalized DMG file from your temporary folder directly to your Desktop for easy access: mv /tmp/Catalina.dmg ~/Desktop/ Use code with caution.

Select your USB flash drive from the left sidebar. (Click View > Show All Devices to ensure you select the root drive, not just a partition). Click at the top. Set the parameters exactly as follows:

Select your main internal hard drive (usually "Macintosh HD") and click . (Format: APFS ). Close Disk Utility and select Install macOS .

If Catalina 10.15.7 (the final version) appears, note its ProductID . Apple hides the direct DMG link, but we can use a helper tool. The Software Update panel in System Preferences will open

~30–45 minutes.

from the utility menu, select your main internal hard drive, and click (format as APFS). Close Disk Utility and select Install macOS to begin the clean installation. Important Considerations for 2026

Are you installing it on or a virtual machine ? What is the exact model year of the destination device?

I can help you find: macOS Mojave (10.14) DMG macOS Big Sur (11.0) DMG How to create bootable media for other versions