Hi Jeff,
The latest version of GateKeeper unfortunately isn't compatible with DNN 5 as it uses a newer version of Telerik which isn't supported in DNN 5. As a solution you have the following 2 solutions:
- Upgrade your DNN instance to version 6+. It is also strongly recommended that you upgrade your DNN instance as there are certain hacker groups that are actively exploiting security vulnerabilities in old versions of CMS platforms such as websites running old versions of DotNetNuke. For more info please see the following link - Click here
- Request a Quote at the following link to provide a custom build of the module for DNN 5 - Request A Quote
Please let me know if you have any questions.