HIGH SIERRA BOOTABLE DISK

If yo have the Stub ~19MB in size, you need the full installer at some 5-6GB in size.

Try running the stub to install, if it loads up the full installer, simply quit the installer.app when it ask for a destination disk.

The install should be safely sitting in your Applications folder— carry forth with your Diskmaker

When creating the Install disk with DiskMaker X, I encounter this error message : “The disk could not be created because of an error: An error occured: -10006.”

This happens sometimes when creating the install disk because a false mount is created as some point. Basically, a false mount is a folder created with the same name as your Install drive, and that makes the Install disk adopt the same name with “1” at the end, i.e. “Install Mac OS Sierra 1”.

If this error happens:

• in Finder, click on Go > Go to Folder menu ;
• Type /Volumes/
• If a folder (not a disk !) is named “Install macOS Sierra”, “Install OS X Yosemite”, or “Install OS X El Capitan”, delete the folder (you may need admin rights, thus type your admin name and password).
• Reboot your Mac
• Try again.

https://diskmakerx.com/faq/

Other causes of that error...

• rrOSACantAssign = -10006, /* Signaled when an object cannot be set in a container.*/
• rrAEWriteDenied = -10006,
• elCAUnavail = -10006, /* a CA is not available */
• error -10006 errAEWriteDenied or telCAUnavail: a CA is not available

I keep getting the error message:/Applications/Install macOS High Sierra.app does not appear to be a valid OS installer application.

I have followed the Apple menu to this point. Apple support was no help.

Thank you for your reply. If I load the app, it says it is ready to install to my hard disk. Is that what you mean? If so, I've already done that. I down loaded the app from the Apple site. Any place else to get the full app?

I have tried the above multiple times, and spent over 1 hour in a chat with an Apple rep, but the same thing still happens. It only gives me the small version. I did download and update my High Sierra to the latest versions, etc., which obviously required the full version to be available, but still it goes back to the previous error.

I have an older iMAC from 2011, so I really wanted to have a bootable device. I do use Carbon Copy Clone for backup, and it tells me I should be able to boot up from the backup, but just wanted the safety.

Thanks for any help.

I do use Carbon Copy Clone for backup, and it tells me I should be able to boot up from the backup, but just wanted the safety.

Then you already have a bootable High Sierra disk. After making a clone, the first thing I do is to test if it boots. If you haven't done this, do it now. If you still want another bootable backup for safety then make a second clone.

You might want to contact the Diskmaker X developer.

Sadly that means you have the little 19MB stub instead of the 4.8GB Full Installer... & nobody knows why some get the stub & a few the full installer using the same link! :(

By "already done that" I meant at that point I cancelled the install.

Absolutely... test it's boot ability first opportunity. :)

You are 100% correct. Worked perfectly. Thank you.

Still don't know why Apple restricts the High Sierra download, since I'm sure a lot of people should have a backup boot source. Oh well.

Well, great to hear! :)

Yeah, seems crazy to limit the download!???