How to Partition and Install a 2nd OSX for a Dual Boot Mac

This should help those who have upgraded to El Capitan and are having issues. If you purchased a new Apple Computer with El Capitan pre-installed, please check with Apple for compatibility with older OSX versions.

[jeansmusic]

This is literally the most comprehensive straight to the point no nonsense tutorial. You are brilliant. Thank you

[drytar]

Thank you so much for this video. I'm turning an inherited iMac that's late 2009 into my own, and needed to revert to Mountain Lion to run the software I intend to use on it. This is the way all instructional videos should be!

[Jesus_Saves__Corinthians_]

This actually helped me out I thought I had to do a clean install but now I did a partition and installed on that and kept my old apps that no longer work on Catalina thanks

[ginaknox]

I agree. This was the best no nonsense tutorial I have ever seen!

[nihilistmia]

Awesome video! Alot of my program's are now unsupported with the new Catalina osx and I was freaking out this is a life saver!!

[DrDaab]

Great Video, with lots of detailed information that makes it very easy to make your Mac Dual Boot.

Thanks for a great job !

[jadecruz]

Finally some straight to the point detailed info. I was looking for this info for a while

[intromix]

This tutorial helped me very much. So much better than trying to follow text, thanks again!

[timothygreer]

Thank you for simple to follow instructions, no unnecessary tech-babble.

[LWashburnDesigns]

Excellent video tutorial. Thank you so much for explaining in details all the steps to be done.

Very concise. Excellent quality voice over with screen shots Like others, I need to keep 10.6.8 to run older programs not compatible with 10.11.6. Thanks.

[sylvainbrosseau]

Very good video. Simple, straight. Thank you.

[MyraMaud]

Thank you so much. So kind of you to help others this way.

[TopherPSU]

Curious as to how you were using an older version of disk utility than came with El Capitan, and how the drives offered to install the OS onto had different names than the ones on your desktop. Any explanation?

[richardkemp]

Thanks mate. This helped alot!!! Cheers from DownUnder...

[zcarm]

Hi, great presentation. Thanks a mill for sharing. For me its not working. I am on Monterey, created a partition, having El Capitan installer on my USB Stick, dbl clicking on it gives me the message - This copy of the “Install OS X” application is too old to be opened on this version of OS X. - If you have any idea on how to get around of this would be great. Thanks

[Marinho]

Dont ever trust on Videos without the like/dislike Option

[daniel.perezvizquel]

This is very nice and instructive. Thank you

[davidporowski]

Liked your video// Gave me hope// Ordered a new mac
But No OSX media// Need a helping hand to back up my
OSX to a USBc thumb drive//
Must be bootable
Thanks for your help

[emilyfowler]

Thank you for your clear video! The issue I'm running into is that within the Installer I'm not getting a window where I can select the destination of which hard drive I want to download to. Instead it just skips over that step in the installation process and only allows me to download the other OS on the normal Macintosh HD. I'm running MAC OS High Sierra. Any advice?