Simultree Crash on Startup, Missing DLL, Gatekeeper & Launch Error Fix (2026)

Quick Fix for Simultree Crashes & Launch Errors: Over 90% of startup crashes, missing DLL errors on Windows, and Gatekeeper prompts on macOS in Simultree (1.0.5 & ALL DLC) are resolved by installing vc_redist.x64.exe, whitelisting the folder in Windows Security (or running xattr -cr on Mac), and launching as Administrator.

→ Download Clean Verified Build of Simultree (1.0.5 & ALL DLC)

Common Simultree Desktop Errors & Proven Solutions

Issue / Error MessageRoot CauseStep-by-Step Fix
Crash on Startup / Silent Exit (Windows)Missing Visual C++ Runtime or Admin privilegesInstall VC++ 2015–2022 (x86 & x64) and enable Run this program as an administrator.
Missing MSVCP140.dll / VCRUNTIME140.dllCorrupted Microsoft C++ runtime librariesReinstall the official Microsoft Visual C++ Redistributable package and reboot your PC.
Missing steam_api64.dll / Activation DLLWindows Defender quarantined the offline loaderOpen Windows Security → Protection History, restore the file, and whitelist the folder.
"App Is Damaged and Can't Be Opened" (macOS)macOS Gatekeeper quarantine flagRun sudo xattr -rd com.apple.quarantine "/Applications/Simultree.app" in Terminal.

Related Guides: Main Download Page | Installation Guide | System Requirements

Simultree – Windows 10/11 & macOS Configuration, Preset & Save Data Paths

When backing up user profiles, presets, or local save data between a Windows Desktop workstation and a MacBook Pro/Studio for Simultree (1.0.5 & ALL DLC), check these default desktop directories:

Desktop PlatformDefault User Data / Config / Preset DirectoryBackup & Migration Notes
Windows 10 / 11 (x64)%APPDATA%\{Simultree}\ or %USERPROFILE%\AppData\LocalLow\{Simultree}\Back up this folder before installing a newer version or resetting preferences.
macOS (Apple Silicon M1–M4 / Intel)~/Library/Application Support/Simultree/ & ~/Library/Preferences/Use Cmd + Shift + G in Finder to open hidden Library paths directly.

Release Metadata Summary – Simultree

  • Title / Package: Simultree
  • Verified Build Version: 1.0.5 & ALL DLC
  • Archive Size: 105.28 MB
  • Category: Strategy
  • Target Desktop OS: Windows 10/11 (64-bit) & macOS Desktop (Apple Silicon M1/M2/M3/M4 & Intel)
  • Primary Download Hub: Download Simultree (1.0.5 & ALL DLC) Full Desktop Build

Frequently Asked Questions – Simultree (1.0.5 & ALL DLC)

Is Simultree (1.0.5 & ALL DLC) free to download on GOG Unlocked?

Yes, Simultree (1.0.5 & ALL DLC) is available as a full-version direct download on GOG Unlocked with verified mirror links and complete release files.

How do I install Simultree without errors?

Download the complete archive from the mirror links, extract using 7-Zip or WinRAR into a path without special characters, install any required runtime redistributables, and launch the main executable.

Does this release of Simultree include the latest updates?

This listing provides build 1.0.5 & ALL DLC of Simultree, tested for offline play and compatibility with modern operating systems and emulators.

What should I do if Simultree crashes on startup?

Verify that your GPU drivers and Visual C++ / DirectX runtimes are updated, run the executable as administrator, and ensure your antivirus did not block any extracted game files.