Postman which I thought worked locally on my computer, is down

Just use cURL.

It will never disappear, enshittify, or let you down. It's already modern, and has a great UI. It's available everywhere. It supports every protocol and feature under the sun. Those fancy features you think you need: you don't. Whatever you're missing can be easily added via simple shell scripts or aliases.

> It will never disappear

They started hardening our images and curl went poof.