This message means Windows couldn’t load a required library (DLL) for the app. It’s usually a missing/disabled runtime, an out‑of‑date Windows component, or a security product blocking the file.
Quick fix (most cases)
Run Windows Update → install all pending updates → Restart.
Keeps code‑signing, TLS, and system components current.Repair/enable .NET Framework 4.8
Windows 10/11: Apps → Optional features → More Windows features → ensure .NET Framework 4.8 Advanced Services is checked. If it’s already on, uncheck → OK → restart → re‑enable to repair.
Install/Repair Microsoft Visual C++ Redistributables
Install both 2015–2022 x86 and x64 packages (repair if already installed).
Re‑download & reinstall CNC Simulator Pro
Right‑click installer → Properties → if you see Unblock, tick it → OK.
Verify the file is digitally signed by Zyntaxis SRL before running.
Temporarily pause AV or allow/restore if it quarantined a file, then re‑enable.
If you still get the error
Note the exact name of the missing assembly shown in the error (e.g.,
System.Data.SQLite.dll
,Blocks.dll
).Try on another PC (helps rule out a local policy/AV issue).
Send us a report (see template below).
Common causes & how to spot them
Out‑of‑date Windows components
Symptoms: fresh install on older or rarely‑updated Windows; SmartScreen or TLS trust errors elsewhere.
Fix: Windows Update + restart..NET Framework not present/healthy
Symptoms: error appears immediately at launch; Event Viewer may show.NET Runtime
exceptions.
Fix: Enable/repair .NET Framework 4.8 (see steps above).Missing VC++ runtime
Symptoms: mentions a native DLL orapi‑ms‑win‑crt
failure.
Fix: Install/repair VC++ 2015–2022 x86 & x64.Antivirus quarantined a dependency
Symptoms: file disappears after install; AV history shows a block/quarantine.
Fix: Restore/allow the file and folder; add an exception; re‑install.File is marked as downloaded/blocked
Symptoms: installer runs but app fails; file shows Unblock checkbox in Properties.
Fix: Unblock and reinstall.32/64‑bit mismatch (rare)
Symptoms: error references provider/driver DLLs (e.g., database or USB drivers).
Fix: Use the matching x86/x64 driver or app build.
What to send support (fastest resolution)
Email support@cncsimulator.com with:
Subject: Assembly load error at start-up
Exact error text (copy/paste or screenshot): <text or image>
CNC Simulator Pro version: <e.g., 4.0.1.4>
Windows version: <e.g., Windows 11 Pro 23H2>
What I tried already: <Windows Update / .NET repair / VC++ repair / reinstall / AV restore>
Did it work on another PC? <yes/no>
Tip: If the dialog names a specific DLL, include that name.
Safety reminder
Only install from our official download links and verify the digital signature = Zyntaxis SRL. Never send passwords or payment details in tickets.
Bottom line: This error is almost always fixed by updating Windows, repairing .NET 4.8, installing the VC++ runtimes, and reinstalling with the file unblocked. If it persists, send us the exact error text and we’ll pinpoint the missing piece.