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We understand the issue with launching into ERLC and it has been patched for V2

Multi Instance

How Multi-Instance Works

Roblox prevents multiple instances using two mechanisms:

  1. ROBLOX_singletonMutex — a Windows named mutex

  2. Process detection — Fishstrap checks for running processes

Alt Central handles both automatically:

  • Bootstrapper auto-config — detects Fishstrap/Bloxstrap/Voidstrap and enables multi-instance

  • Native mutex holdermutex_holder.exe holds the mutex for vanilla Roblox

Fishstrap / Bloxstrap / Voidstrap

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Alt Central auto-enables multi-instance on startup. If it's still not working, configure manually:

1

Open Bootstrapper Settings

Find settings at:

  • Fishstrap: %LOCALAPPDATA%\Fishstrap\Settings.json

  • Bloxstrap: %LOCALAPPDATA%\Bloxstrap\Settings.json

2

Enable Multi-Instance

Turn ON: "Allow multi-instance launching" Turn OFF: "Confirm launches"

3

Restart

Close and restart the bootstrapper, then try Alt Central again.

Error 773: Place is Restricted

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ERLC teleports players from a lobby to the actual server. When multiple instances share RobloxCookies.dat, the teleport auth gets mixed up.

Alt Central's fix: You cant know this silly!

If you still get 773:

  1. Click Leave All to close everything

  2. Wait 10 seconds

  3. Relaunch — the cookie file should be clean

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Instances Closing Each Other

This happens when the bootstrapper has multi-instance disabled. Each new launch kills the previous instance.

Fix: Enable multi-instance in bootstrapper settings (see steps above).

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