Cannot download the Public API document on support website

[Birdy]

https://docs.ruckuswireless.com/smartzone/6.1.2/vszh-public-api-reference-guide-612.html

https://docs.ruckuswireless.com/smartzone/7.0.0/vszh-public-api-reference-guide-700.html

All versions of Public API files cannot be downloaded. Can you help solve this problem?