Custom Price Calculator by ApiPPA Not Downloading?

[Jadetpb]

Hi I want to add the custom price calculator by ApiPPA. 

When I click add app I get a error message : 

Misdirected Request

The client needs a new connection for this request as the requested host name does not match the Server Name Indication (SNI) in use for this connection.

Can anyone help with this? 

Thanks!