I cannot install any other version of Mac OS except 10.9

verify you are using the Safari browser to download/initiate the macOS links.

The older macOS installer backups on this server:

How to get old versions of macOS - Apple Support

OS X Yosemite - Technical Specifications - Apple Support

To obtain versions AFTER 10.11 El Capitan, you may need to install !0.11 El Capitan as a waypoint, before going further.

!0.11 El Capitan features an Improved Mac App Store App, that makes obtaining later versions more reliable.