Unable to download iOS on a used MacBook Air

Bonehead567 Said:

"Downloading os: Just got a used macbook air and l cannot download the os"

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Installing the macOS:

Determining which Update(s) will Install:

I. Verify Compatibility:

A. Start Here: Learn About Compatibility and how to Identify your Specific Mac Model - Apple Support

B. How to Verify:

I Reveal your Model:

What is the Model of your Mac? To find out...

1. Go to: Apple menu
2. Click: About this Mac
3. View: Second Line-Down

then...

II. Compare the Results:

See if the Model you found is shown here:

• macOS Sonoma is Compatible with these Computers - Apple Support
• macOS Ventura is Compatible with these Computers - Apple Support
• macOS Monterey is Compatible with these Computers - Apple Support
• macOS Big Sur 11 Hardware Requirements - Apple Support
• macOS Catalina 10.15 - Hardware Requirements - Apple Support
• macOS Mojave 10.14 - Hardware Requirements - Apple Support
• macOS High Sierra 10.13 - Hardware Requirements - Apple Support
• macOS Sierra 10.12 - Hardware Requirements - Apple Support
• OS X El Capitan 10.11 - Hardware Requirements - Apple Support
• OS X Yosemite 10.10 - Hardware Requirements - Apple Support

III. If Compatible:

Back Up your Mac First:  Be certain you Create a Time Machine Backup of your Mac, so that way you can have something to restore your Mac from, should anything go wrong with the reconfiguration.

Bonehead567 Said:

"Downloading os: Just got a used macbook air and l cannot download the os"

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Installing the macOS:

It it best to set this up anew, as if you were to sell it. Perform as instructed here, including the iCloud logout: What to do Before you Sell, Give Away, Trade in, or Recycle your Mac - Apple Support

So, try the following...

A. Use Ethernet:

Using a hardware connection is usually more reliable than a wireless one. Use this adapter, if you have no Ethernet connection: Apple USB Ethernet Adapter - Apple

B. Use Internet Recovery Mode:

Hold these three keys down upon boot: Option-Command-R

Has the machine been erased? What year is your MacBook?