Typically, the Patch Manager Plus server retrieves patches directly from the vendor sites and then subsequently gets deployed to the endpoints. In certain cases, patches can't be directly downloaded due to SSL Handshake exception error that occurs when there is an issue with the communication between the client and server. In such case, you can manually download the patch and upload it to the patch store directly from the console using the upload patches option.
Follow the steps given below to resolve this issue:
If the issue persists even after following the above-mentioned resolutions, please feel free to contact support.