

Please quote the error message when doing so.Hello reecemay92 and welcome to the Autodesk community! If you are still receiving the error please contact our support team. This button is available for about an hour after you try to open the app.


Do the same thing to the installation package hold down the control button, click it and select open.

Hold down the control button and then click the "DMG" (software installer file), and select open.Click the “Open” button at the next dialog warning to launch the app anyway.Right-click (or control-click) the application in question and choose “Open”.If necessary, try them in the following order: This is general this is a good security measure, but it can sometimes cause issues like this. This error occurs because your computer is set up such that it will only let programs install that have been vetted by Apple. "Digital Editions 4.5 Installer.pkg can't be opened because it is from an unidentified developer."
