If you are researching this for personal use, there are two major caveats to keep in mind:
It automatically downloads the correct Java version for older versions (like Java 8 for 1.12.2) and modern ones (Java 17+ for 1.18+). whats sklauncher
When you launch the official Minecraft launcher, it performs an authentication handshake with authserver.mojang.com . The server returns a short-lived access token. Without that token, the game won’t start—or will start in demo mode. If you are researching this for personal use,
is a custom, third-party launcher for Minecraft. It is designed to bypass the official Mojang login system, allowing players to access Minecraft without owning a premium (paid) account on Microsoft/Mojang servers. whats sklauncher