Hey maanselmi65,
If I understand correctly, you want to upgrade the macOS on you late 2010 MacBook Air and want to know if it meets the requirements. The first article provides the requirements and a way to see how much storage is on the MacBook Air currently. If it does show there is anything else on the computer other than just the OS, you can try to locate it. I would recommend you read these articles, use them to help troubleshoot the issue.
It also requires at least 2GB of memory and 8.8GB of storage space.
- iMac (Mid 2007 or newer)
- MacBook (Late 2008 Aluminum, Early 2009, or newer)
- MacBook Pro (Mid 2007 or newer)
- MacBook Air (Late 2008 or newer)
- Mac mini (Early 2009 or newer)
- Mac Pro (Early 2008 or newer)
- Xserve (Early 2009)
- OS X Yosemite v10.10
- OS X Mavericks v10.9
- OS X Mountain Lion v10.8
- OS X Lion v10.7
- Mac OS X Snow Leopard v10.6.8
To find your model, memory, storage, and macOS version, choose About This Mac from the Apple menu ().
Upgrade to OS X El Capitan - Apple Support
Another thing you can do is try to locate items that may be taking up room.
You can find your largest files and then compress them or move them to another disk.
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In the Finder, choose Go > Home, or press Shift-Command-H.
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Choose File > Find, or press Command-F.
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Click the Kind pop-up menu, then choose Other.
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Below “Select a search attribute,” select the File Size checkbox. Make sure no other checkboxes are selected, then click OK.
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Click the “equals” pop-up menu, then choose “is greater than.” Click the “KB” pop-up menu, then choose “MB.”
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Enter a minimum file size. A good starting point is 100 MB. You can change the value to see more or fewer results.
Searching begins as soon as you type a file size. It may take a moment for all the search results to appear.
OS X El Capitan: Increase disk space
Thank you for using Apple Support Communities. Have a good one.