The launcher itself was a tiny .exe (or .app for Mac). It weighed less than 1MB. Its only job was to check a specific URL hosted on Notch’s server: minecraft.net/version.txt .
The launcher would download the new minecraft.jar into the currently running memory space ? No—it saved it to disk, then prompted a restart. This created a "Hybrid" system: Minecraft Alpha - Auto-update launcher - Hybrid...
Today, the "Minecraft Alpha - Auto-update launcher - Hybrid" keyword is searched by preservationists and modders trying to recapture that specific friction. You cannot simply download the "Alpha launcher" and run it, because the original update server ( minecraft.net ) now responds with modern JSON manifests that will break the ancient executable. The launcher itself was a tiny
Initially, many players ran the game directly from the browser. However, as the game grew, Markus "Notch" Persson released a standalone launcher. This was a critical innovation. It allowed players to keep the game on their desktop without navigating to a website every time they wanted to play. The launcher would download the new minecraft
The Minecraft Alpha Auto-Update Launcher laid the DNA for every game launcher today. The "Hybrid" concept (web-driven content with native execution) is now standard (see: Discord, Slack, VS Code). But in 2010, it was revolutionary.