Hi,
You can find the downloads at SAP service market place.
SAP Service Marketplace - Home
Click SAP Support Portal (middle of the screen)
Click Software Downloads (grey top menu bar)
Click Support Packages and Patches (middle of the screen under A-Z index)
Select 'S'
Select 'SDK for SAP ASE'
This is the location for the latest downloads.
Older downloads can be found in 'SY Software Developer Kit'
I believe refresh is the PC Client that includes SDK and GUI tools for windows.
Go back to the A-Z letter screen.
Select 'Installation and Upgrades'
This can be found under 'A'
Click 'SAP Adaptive Server Enterprise'
Refresh is around SP100 I believe.
Not 100% on the exact version, but this is one of the last PC Client downloads as it is being EOL.
Sybase Central that came in PC Client is EOL.
DBISQL / interactive SQL is being moved to the SDK in 16.x.
Regards,
Ryan