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Why is my CPT not working in Mac OS 10.15 Catalina or later? How can I fix it?

CPT delivered on a USB / downloaded

Classroom Presentation Tool might not be able to install on iOS Mac Catalina (10.15) or later due to Apple’s third party developer block. In these Mac operating systems, when an app fails to install because it hasn’t been notarized or is from an developer not identified by Apple.

It might appear in System Preferences > Security & Privacy, under the General tab. Click Open Anyway to confirm your intent to open or install the app.

The warning prompt reappears, and you can click Open.*

The app is now saved as an exception to your security settings, and you can open it in the future by double-clicking it, just as you can any authorized app.

*If you’re prompted to open Finder: control-click the app in Finder, choose Open from the menu, and then click Open in the dialog that appears. Enter your admin name and password to open the app.

 

If still facing difficulties, follow the instructions below:

From Mac High Sierra onwards, some of our CPT’s will not be able to install on these systems due to Apple’s 3rd party developer block. There are two workarounds to allow Users to install:

WORKAROUND 1

These are the steps to follow:

  1. Download the CPT.
  2. Unzip the CPT.
  3. Move app to Applications folder.
  4. Open Terminal app and enter the following command: sudo xattr -dr com.apple.quarantine /Applications/App Name.app (e.g. sudo xattr -dr com.apple.quarantine /Applications/Life_BRE_2e_Elementary_v2.app).
  5. Hit return and authenticate with an admin/system password.
  6. Launch the CPT again.

 

WORKAROUND 2

  1. Open the Terminal app from the /Applications/Utilities/ folder and then enter the following command syntax*: sudo spctl –master-disable* NOTE: There are two dashes (- -) before master-disable:

2. Hit return and authenticate with an admin password.

3. Relaunch System Preferences and go to “Security & Privacy” and the “General” tab.

4. You will now see the “Anywhere” option under ‘Allow apps downloaded from:’ Gatekeeper options.

5. Now Control-click the CPT app icon, then choose Open from the shortcut menu.

6. Click Open.

7. Once the CPT is installed and can be launched, go back to Terminal app from the /Applications/Utilities/ folder and then enter the following command syntax to reestablish the initial settings by which Apple blocks all third party developer apps: sudo spctl –master-enable

Legacy CPT delivered on a CD/DVD

Mac OS 10.15 Catalina and later operating systems do not support 32 bit applications. Our legacy CPTs delivered on a CD/DVD are 32 bit applications. For instructions on how to upgrade to the newest edition, please contact your sales representative.