It can be done but it's involved > http://www.gottabemobile.com/2015/09/30/how-to-downgrade-to-os-x-yosemite-from-e l-capitan/
Qr code mac app. Installing sugarsync app on mac.
You weren't being foolish at all. It's easy to miss something when it comes to an upgrade and unfortunately, third party software can cause glitches if the developer has not updated for compatibility with the latest OS X.
If you absolutely must remove those files (say, if you want to reset an app to its default settings), you can use a handy app called AppCleaner to fully uninstall an app, along with all its extra files. Just launch AppCleaner, search for an application in its main window, and click on it, then click the “Remove” button in the popup window.
This article will help you downgrade from any version of the Mac operating system to an older version - so if you are looking to downgrade from Catalina, Mojave, High Sierra, Sierra, El Capitan. Uninstall Then Reinstall iTunes. The last solution is to remove and reinstall iTunes. One way to do this is: Launch the Terminal app, which you can find in the Utilities or Applications folders. Use the command cd /Applications/ Follow this with sudo rm -rf iTunes.app/ If you are asked, enter your password then hit Return.
Don't be too hard on yourself.
You might want to hold off reverting to Yosemite and contact the Capture One developer > https://www.phaseone.com/en/Downloads/Materials/Download-Capture-One-8.aspx?
They may have an update in the works.
Oct 6, 2015 7:44 PM
These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.
Uninstall Apps Mac El CapitanWhat you need to create a bootable installer
Install El Capitan AppDownload macOS
Use the 'createinstallmedia' command in Terminal
Big Sur:*
Catalina:*
Mojave:*
High Sierra:*
Uninstall Mac App El Capitan Installer
El Capitan:
* If your Mac is using macOS Sierra or earlier, include the
--applicationpath argument and installer path, similar to the way this is done in the command for El Capitan.
After typing the command:
Use the bootable installer
After creating the bootable installer, follow these steps to use it:
Uninstall App Mac Os El CapitanLearn more
For more information about the
createinstallmedia command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter the appropriate path in Terminal:
El Capitan For Mac
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