The App Store app will open automatically to the macOS Catalina page. Click the button. This will trigger the Software Update tool in your System Preferences to begin downloading the large installer file. Step 3: Run the Installer
Click the "Get" or "Download" button on the macOS Catalina page. The installer will download into your folder.
macOS Catalina requires at least 15GB to 20GB of free storage space to download and install smoothly. To check your available space, go to > Storage . 2. Backup Your Data (Crucial Step)
| Issue | Solution | |-------|----------| | “This copy of the Install macOS Catalina application is damaged” | Set date manually via Terminal: date 0101010116 | | Installer won’t open | Check Gatekeeper: Right-click the installer → | | Not enough space | Use Storage Management to remove old iOS backups, large files |
Because of the version gap, you cannot simply click "Update" in System Preferences. You need the full installer. Open the App Store on your Mac. Search for "macOS Catalina". how to update macos high sierra 10136 to 1015
Catalina requires significantly more space to install than High Sierra. Ensure you have at least 20GB to 30GB of free space on your startup drive. Phase 2: Updating from High Sierra to Catalina
To help me tailor any further troubleshooting advice, let me know: What specific do you have?
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Your Mac will open the preference pane and begin downloading the file. The download is roughly 8 GB, so completion time depends entirely on your internet speed. Step 2: Run the macOS Catalina Installation Wizard The App Store app will open automatically to
Because macOS Catalina is a few years old, Apple often hides it from search results in the App Store. If the above search doesn't work, use this direct link:
Now I need more comprehensive details. I'll search for "how to get macOS Catalina installer from Apple Support". I'll also search for "createinstallmedia Catalina command" and "Catalina upgrade stuck on High Sierra". search results provide direct download links for Catalina updates, information on the createinstallmedia command, and discussions about recovery mode issues. Now I need more detailed troubleshooting steps and system requirements. I'll search for "macOS Catalina compatibility check" and "macOS Catalina 32-bit app compatibility". search results for "macOS Catalina compatibility check tool" and "check 32-bit apps macOS High Sierra" provide some relevant information. Now I need to gather more details on creating a bootable USB installer and on fixing common Catalina upgrade errors. I'll search for "fix macOS Catalina upgrade error High Sierra" and "how to free up space on Mac for Catalina". search results provide some information on installation errors and freeing up disk space. However, for a comprehensive guide, I also need official steps from Apple. I will search for "How to upgrade to macOS Catalina Apple Support". search results include a link to an Apple support page that might provide official upgrade instructions. I will open result 2. Apple page provides official upgrade instructions and system requirements. It confirms that upgrading from High Sierra (10.13) to Catalina (10.15) is possible via the App Store. Now I need to gather more detailed steps and potential issues. I'll search for "macOS Catalina App Store not showing fix". search results include a direct link to the Catalina page on the App Store. Now I need to find a page that details how to create a bootable installer using Terminal. I'll open result 1 from the search for "createinstallmedia". page provides information on creating a bootable USB installer and troubleshooting the createinstallmedia command. Now I need to find a page that details how to fix common Catalina upgrade issues. I'll open result 0 from the search for "macOS Catalina installation error High Sierra". page provides a tip for fixing installation errors. Now I need to find a page that details how to free up disk space for Catalina. I'll open result 5 from the search for "free up disk space for macOS Catalina upgrade". page provides methods to free up disk space. Now I need to find a page that details how to check for 32-bit apps on High Sierra. I'll open result 1 from the search for "check 32-bit apps macOS High Sierra". page provides information on 32-bit app compatibility. Now I have gathered enough information to write the article. I will structure it as a comprehensive guide covering: introduction, preparation (system requirements, compatibility checks, backup), how to upgrade (different methods, troubleshooting missing updates), post-upgrade tips, and conclusion. I will cite relevant sources.grading from macOS High Sierra 10.13.6 to macOS Catalina 10.15 is a significant leap that unlocks a host of modern features, including a redesigned Music, Podcasts, and TV apps, the innovative iPad Sidecar feature, and stronger security protocols. While this upgrade can breathe new life into an older Mac, the age of the software and hardware means a bit of preparation is key. This guide provides a comprehensive, step-by-step approach to ensure your transition to Catalina is smooth, safe, and successful.
If your Mac is older than the models listed above, it cannot officially run macOS Catalina. Forcing an installation on unsupported hardware requires third-party patchers, which can compromise system stability. Phase 2: Essential Pre-Update Checklist
Summary
You need a minimum of 12.5 GB of available storage if upgrading from High Sierra. Apple recommends keeping up to 20 GB free to prevent installation stalls. Memory: At least 4 GB of RAM is required.
Let me know and I’ll adjust the steps. But “10136 to 1015” most clearly means .
If you are considering this, make sure to back up your data and ensure hardware compatibility.