OS is Mojave, 10.14.6

I tried downloading the package manually. I received a message that the website's certificate was not trustworthy. I ignored this warning.
The download worked. After the download I shift the package in the BB Download Folder. After this I was able to install the package using the Install Manager.

May there is a problem with the Certificate.

I will send the logs to the webmaster for troubleshooting.
Regards Ekkehard