> Source: [sk173415](https://support.checkpoint.com/results/sk/sk173415)

# sk173415 - "Endpoint Security Installer cannot be opened because the developer cannot be verified" error message appears when user fails to install Endpoint Security Client on macOS Catalina or higher 

| Property | Value |
|----------|-------|
| Solution ID | sk173415 |
| Date Created | 2021-05-06 |
| Last Modified | 2021-05-13 |
| Technical Level | General |
| Products | Endpoint Security |
| Versions | Cloud, E89.X, E88.X, R82.20, R82.10, R82, R81.20 |
| OS | macOS |

## Symptoms

- When the user fails to install the Endpoint Security Client for Mac on macOS Catalina or higher, the following message appears:  
![](https://sc1.checkpoint.com/sc/SolutionsStatics/NEW_SK_NOID1620290768391/MAC_EP_Install202105061149581.png)

## Solution

Use the solution provided by Apple to add the Endpoint Security application to excluded apps - [HT202491](https://support.apple.com/en-us/HT202491). See the section *"If you want to open an app that hasn't been notarized or is from an unidentified developer"* and follow the suggested steps to allow the Endpoint Security Client installation.

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