In ATC, clicking Settings then Download displays page for 'Downloadable items'.
When the 'More information' button in the Cloud Proxy for Windows and Cloud Proxy for Linux is clicked and empty page containing: 
is displayed. The equivalent link for 'Agent import tool' works.
Settings > Downloads displays:
Clicking More Information shows:
DX SaaS APM
The issue is related to defect [DE559933]
Workaround: For now you can refer to Techdocs documentation: https://techdocs.