I see no reason why ask elsewhere first, the link for the installer download is on the Postgresql website, not elsewhere. The most logical thing to do is ask here first.
Based on your feedback, it is NOT the link listed on the PostgreSQL website,
With all due respect, the link he posted IS the link listed on the PostgreSQL website, at least for me. When I go to the link YOU posted, and click on MacOS, for example (giving me a URL of https://www.postgresql.org/download/macosx/), the FIRST option listed there is "Interactive installer by EDB”, which links to https://www.enterprisedb.com/downloads/postgres-postgresql-downloads. There is no indication on that page that you are linking to a third-party package download not supported by PostgreSQL (it does say “certified by EDB”, but that doesn’t mean much to a new user, and certainly doesn’t indicate a lack of support by PostgreSQL), so it makes total sense that someone would think to ask here first when experiencing issues.
If you don’t want to offer assistance, that’s fine, but this link most certainly IS the link listed on the PostgreSQL website, at least for MacOS. I haven’t checked for other operating systems.
Your comment means that the owners of any web page which links to a third party product must support that third-party product, just by virtue of supporting it. That's crazy.
