I want to upgrade postgresql from 9.4.4 to 9.4.14.
I couldn't find the minor versions of postgresql from the download pages.
Always letting it to the latest version in the mappings of 9.4.x
Yes, and there are good reasons for that. Why would you want 9.4.14 and not 9.4.16, given that 9.4.16 contains critical bugfixes that are missing in 9.4.14?
how to get into the minor version download?
The PostgreSQL project does not provide binary packages for old known buggy versions. You can always get the source code and build it yourself though -- you can find 9.4.14 in https://www.postgresql.org/ftp/source/v9.4.14/