I know these both links but, I have upgraded version from 6.4.0 to 6.4.1 and only link from @davidg was helpful.
Before I wrote post on forum I did this:
2. configured server and clients
When new version was released I wanted to upgrade from 6.4.0 to 6.4.1 using
bitnami-elk-6.4.1-0-windows-x64-installer.exe but it didn't work, installer could not upgrade old version but created new instance.
And here I have used version from link from @davidg.
I just wanted to open link https://artifacts.elastic.co/downloads/elasticsearch but like I mentioned it is NOT FOUND.
Maybe you could consider to create installer that would be able to upgrade old version to new one with "just one click".