Crashes have a handful of common causes and they are worth trying in order — the cheap fixes solve most cases and take two minutes. Work down the list rather than jumping to reinstalling.
If the error mentions EAC, the anti-cheat service is not running or is being blocked. Reinstall it directly: go to your Rust folder, open EasyAntiCheat, run EasyAntiCheat_Setup.exe and choose repair. Then add both Rust and EAC as exclusions in your antivirus — aggressive antivirus blocking EAC is a very common cause.
Rust closing to desktop after twenty minutes without an error message is usually memory. Check that your page file is enabled and system-managed — people who disabled it on advice from a forum see exactly this. On 8 GB of RAM, close everything else before launching.
If you have any overclock on CPU, GPU or RAM — including XMP or EXPO memory profiles — set everything to stock and test. Rust is unusually good at exposing an overclock that seemed stable in every benchmark. This catches more crashes than people expect.
A full reinstall is rarely the answer and costs you an evening of downloading. Before that, try moving Rust to a different drive — it rebuilds the install without re-downloading everything and fixes filesystem-level corruption.
Almost always memory or an unstable overclock. Check your page file is enabled, close background apps, and disable XMP/EXPO to test.
The EAC service did not update cleanly. Restart Windows, then repair EAC from EasyAntiCheat_Setup.exe in the Rust folder, and make sure your antivirus is not blocking it.
No. It only replaces game files. Your client.cfg and keybinds stay.