How to Upgrade to macOS 26: Full Guide

Upgrading to macOS 26 brings the latest features, security patches, and performance improvements to your Mac. This guide walks you through the entire process, from checking compatibility to troubleshooting common issues, so you can upgrade safely without losing data.

What You’ll Need

A compatible Mac model (see Apple’s official list for macOS 26).
At least 20 GB of free storage space.
A stable internet connection (Wi-Fi or Ethernet).
Time: roughly 30–60 minutes for download and installation.
Optional but recommended: a Time Machine backup or external drive.

Step-by-Step

Back up your Mac. Connect an external drive and go to System Settings > General > Time Machine. Turn it on and select the drive. Wait for the backup to complete. This is your safety net if anything goes wrong.
Check compatibility. Go to Apple menu > About This Mac to see your model and year. Verify it’s on Apple’s official macOS 26 compatibility list. If not, stop here.
Free up storage. Open System Settings > General &em; Storage. Delete unused apps, large files, and clear caches. You need at least 20 GB free; 30 GB is safer.
Connect to power and internet. Plug in your Mac (especially if it’s a laptop) and connect to a reliable network. Avoid public Wi-Fi; use a wired connection if possible.
Open System Settings. Click the Apple menu in the top-left corner, then select System Settings.
Go to Software Update. In the sidebar, click General, then Software Update. Your Mac will check for updates.
Click “Upgrade Now” or “Update Now.” If macOS 26 appears, click the button. If it says “Your Mac is up to date,” wait a few minutes and refresh, or use the App Store as an alternative.
Follow the on-screen prompts. The installer will download (may take a while). You’ll be asked to agree to terms, choose a disk (usually your main drive), and enter your admin password.
Wait for installation. Your Mac will restart several times. Do not interrupt it. Keep the lid open and the power connected.
Complete setup. After installation, you’ll see the welcome screen. Sign in with your Apple ID, and your files and settings should be intact.
Check for updates. Once on macOS 26, go back to System Settings > General > Software Update to install any minor updates or security patches.

Common Mistakes

Skipping the backup. Even though upgrades usually go smoothly, a power outage or software glitch can corrupt data. Always back up first.
Not checking storage. Running out of disk space mid-installation can cause errors or a failed upgrade. Check storage before starting.
Using an unsupported Mac. Forcing an installer on an incompatible model can brick it. Stick to official compatibility.
Interrupting the installation. Closing the lid, unplugging, or restarting manually during installation can leave your system in a broken state.
Ignoring app compatibility. Some older apps may not work on macOS 26. Check with developers before upgrading if you rely on specific software.
Upgrading over a slow or unstable connection. A dropped download can corrupt the installer. Use a reliable network.

Tips

Use Time Machine or a clone. A full backup lets you roll back to your previous macOS if needed.
Close all apps before starting. This reduces the chance of conflicts during installation.
Do it overnight. The download and install can take a while. Start when you don’t need your Mac for a few hours.
Keep your Mac plugged in. For laptops, this prevents battery drain during the process.
Update your apps first. Install any pending app updates before upgrading to ensure compatibility.
Have a second device handy. If you run into trouble, you can look up solutions or contact support.

Troubleshooting

Upgrade button not showing. If macOS 26 doesn’t appear in Software Update, your Mac may not be compatible, or the update is rolling out in waves. Try again later, or search for “macOS 26” in the App Store. If it’s not there, your model may be unsupported.

Download stuck or slow. Pause the download, restart your Mac, and try again. Switch to a wired connection if possible. Clear your DNS cache by running sudo dscacheutil -flushcache in Terminal if you’re comfortable with it.

Installation fails with an error. Restart your Mac, ensure you have enough free space, and try again. If the error persists, boot into Safe Mode (hold the power button until “Loading Safe Mode” appears) and attempt the upgrade from there. Safe Mode disables some third-party software that might interfere.

Mac is stuck on a black screen or Apple logo. Wait at least 15 minutes—installation can take time. If it’s still stuck, force restart by holding the power button for 10 seconds, then try again. If it fails repeatedly, you may need to use Recovery Mode (hold Command+R at startup) and reinstall macOS from there, or restore from your backup.

Apps won’t open after upgrade. Some apps need updates for the new OS. Check the App Store for updates, or visit the developer’s website. If an app is incompatible, consider alternatives or contact the developer.

Wi-Fi or Bluetooth not working. Reset the NVRAM (on Intel Macs, restart and hold Option+Command+P+R) or the SMC (specific steps vary by model). On Apple Silicon, just restart. If the issue persists, go to System Settings > General > Transfer or Reset and try resetting network settings (note: this removes saved Wi-Fi passwords).

Battery drains quickly. This is common in the first few days as Spotlight reindexes and background tasks run. Give it a week. If it continues, check Activity Monitor for high energy usage.

Frequently Asked Questions

Will I lose my files during the upgrade? No, upgrading preserves your files, apps, and settings. However, always back up first in case of an unexpected failure.

How long does the upgrade take? The download can take 20–60 minutes depending on your internet speed, and installation adds another 30–60 minutes. Total time varies.

Can I go back to my old macOS after upgrading? Yes, but only if you have a backup or can download the previous version from the App Store. You’ll need to erase your disk and reinstall, then restore from backup.

What if my Mac is too old for macOS 26? You can stay on your current macOS version, which will still receive security updates for a while. Alternatively, consider upgrading your hardware.

Do I need to pay for macOS 26? No, macOS upgrades are free for compatible Macs.

Why is my Mac running slower after the upgrade? Spotlight indexing and other background tasks can slow things down for a few hours to a day. If it persists, check for software updates and restart your Mac.

General steps for current mainstream versions; menus can differ by device and version. See the disclaimer or report an error.

More in this bed

The whole Tech How-To bed →