Hi Ronald,

Crystal Designer 2016 (BI 4.2) is already released. If you wanted to use Crystal designer 2016 then yes you have to upgrade the server also to the same patch and same level KBA :

KBA 1376876 - SAP BusinessObjects products and components should be updated to the same Patch version level

Also, BI 4.0 and BI 4.1 share same license but BI 4.2 requires new license so either you can directly request for the BI 4.2 License or issue BI 4.0/4.1 license and then request the conversion to BI 4.2 using :  

Where and How to request License Key

• Link to access the New License Key application : https://support.sap.com/keys-systems-installations/keys.html
• Step by step guide to New License Key application:https://support.sap.com/content/dam/library/SAP%20Support%20Portal/keys-systems-installations/keys/new-request-license-keys-bobj.pdf

Regards,

Mahak