Self-updating Application with SHA1 check and FireDAC

- or basic self-improvement with room for improvement.

There are many ways to keep the users windows applications updated, like pushing them out via enterprise distribution setups, click-once, Squirrel (not the scripting language or the animal). But what if I just want the basics - and as simple as possible?

Disclaimer: This is not a post about security - even if SHA1 is mentioned - this is solely intended as an example on how an update process could be done in a controlled environment - like in-house distribution.