Hi,
You can download archived SDK from:
https://support.sap.com/home.html?url_id=text-SMPHomepage-newsupportportal
select Software Downloads at the top
Select Support Packages and Patches
Select Archive underneath
Select Software Downloads in the middle
New window will appear,
Select Support Packages & Patches
Select Archive A-Z index select S
SY Software Developer Kit
Downloads
Regards,
Ryan Hansen
SAP Digital Business Services