Harden self-update flow, automate checksum maintenance, and improve installer#1

sambhavthakkar wants to merge 3 commits into

Pulkit7070:mainPulkit7070/multigravity-pro:mainfrom

sambhavthakkar:harden-update-install-flowsambhavthakkar/multigravity-pro:harden-update-install-flowCopy head branch name to clipboard