Upgrading I-Mac mid-2010

C_B_20 Said:

“El Capitan just installed. I got through someone in Apple support and he said that from El Capitan I can go straight to Mac Catalina ??”

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That is False.

Go Here: macOS Catalina is compatible with these computers - Apple Support

Back up your data, check your applications for compatibility, download El Capitan, and then High Sierra.

(180306)

C_B_20 Said:

“Thank you. I thought that was way too enthusiastic ...Can I ask another silly question please ? I managed to download two upgrades...InstallOS.dmg and InstallMacOSX.dmg ...which one is El Capitan since nothing really happened...My I-mac still appears to have OS X v10.6.8”

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Open it (Only if Download from Apple):

I am uncertain as to which macOS version it would pertain. Download these from Apple, and none other. If downloaded from Apple, then double-click it, and see what pops up for the MacOS version this applies to. You’d probably see the logo right atop the window that opens.

Find your Installed macOS Version:

As for which macOS version you have installed, to find out:

1. Go to: the Apple menu
2. Select: About this Mac...
3. View: the Third Line-Down.

C_B_20 Said:

"I probably have MacOSX.dmg as OS.dmg is not working...both downloaded from Apple...I don't have the View option either...I will ring them again tomorrow as they operate 9 am to 5pm in Ireland. Thanks for your help."

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You are welcome.

Late-Night Download:

When it is in the middle of the night, try a new download of this file, as network traffic may not be so high. Thing is, if network traffic is more stable, then a more reliable download is likely to come about.