Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
So let me get this straight... MS did not release SPD 2016 so you have to continue to use 2013 (failure one). However, SPD behaves as part of the Office suite and not a stand alone application (failure two). Because of this, you can't install SPD if you have Office 2016 (failure three), because it simply fails to install due to an error without telling you what that error is or why it occured (failure four). There is some indication that MAYBE you can get the 32 bit versions of these products to live together but not 64 bit and certainly not mixed bit (failures five and six except they rather extend from failure two).
Pretty terrible Microsoft. I shouldn't have to have a separate computer just to do Sharepoint design. This is NOT what the enterprise looks like.