Mac users may get an error message when attempting to open or install an application, such as Coeus, that was not downloaded from the App store. The first time you download the Coeus application on a Mac, the application may be blocked and a warning message may appear: “Coeus.jnlp cannot be opened because it is from an unidentified developer.”

Take the following steps to address this Mac warning message when opening or installing Coeus:

1. On your Mac, select System Settings > Privacy & Security.
2. On the General tab of the Privacy & Security window, you will see a message that reads “Coeus.jnlp” was blocked from use because it was not from an identified developer.”
3. To the right of this message, click Open Away.
4. A pop-up message will appear that reads “macOS cannot verify the developer of coeus.jnlp. Are you sure you want to open it?” Click Open.

You should now be able to download the Coeus application. Always use the Launch Coeus Premium link on the Brown University Coeus login page to launch Coeus — not a desktop icon or anything already on your desktop.

Note: The same steps will need to be followed each time you log out and back into Coeus on your Mac. The authorization steps above are “per file,” so users will need to follow these steps for each downloaded copy of Coeus. 

After installing Java on a Mac computer, you may need to set permissions for OpenWebStart to access your file system when submitting proposals in Coeus. On newer Macs, some functions, such as upload of files, may require this for full functionality.

If you encounter this problem:

1. On your Mac, select System Settings > Privacy & Security.
2. Choose Full Disk Access, and change the slider to allow "Full Disk Access" for OpenWebStart.

If you need further assistance, please contact your department's IT personnel directly to further assist with your Mac.

The Office of Information Technology provides additional guidance.