Category: AutoCAD
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AutoCAD Plant 3D 2026.2 Update: Python 3.13 Upgrade and Isometric Improvements
AutoCAD Plant 3D 2026.2 includes few changes that developers and integrators should be aware of. The most significant is an upgrade of the embedded Python runtime from Python 3.11 to Python 3.13.11. This update also improves the custom Python script development experience and corrects isometric continuation annotation behavior in certain flange configurations. Python 3.11 to…
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Getting the OMF 2026 SDK working after the AutoCAD Architecture and MEP .NET 10 updates
With the AutoCAD Architecture 2026.0.2 and AutoCAD MEP 2026.0.2 updates, a dependency on .NET 10 is introduced. This change affects developers using the OMF 2026 SDK and requires updates to both the AutoCAD environment and the OMF sample configuration. Before continuing here, install the required product updates — AutoCAD 2026.1.2, AutoCAD Architecture 2026.0.2, and AutoCAD…
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AutoCAD 2027 Drag-Drop Fixed in Update 1
When AutoCAD 2027 was first released with .NET 10 support, many developers encountered a critical regression: drag-and-drop operations from custom palettes to the drawing area would crash with an InvalidCastException. System.InvalidCastException: Unable to cast COM object of type ‘System.__ComObject’ to interface type ‘System.Windows.Forms.IDataObject’. QueryInterface call failed with E_NOINTERFACE (0x80004002). What Caused It? This was a…
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Autodesk Desktop Products 2025/2026: .NET 10 Updates
Microsoft has announced that .NET 8 and .NET 9 will reach end of support on November 10, 2026. After this date, Microsoft will no longer provide updates, including security fixes or technical support, for these versions. To stay current and secure, Autodesk products are updating their .NET dependency to .NET 10 across the 2026 and…
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The Fourth Cause of ODIS Error 15: A Stale PE Signature Directory
A previous post, Building a Signed AutoCAD OEM Installer — Avoiding ODIS Error 15, lists three causes of Error 15: never signed, signed then modified, or a certificate problem. There is a fourth, less obvious cause: a stale entry in a file’s PE signature directory that blocks signing tools from writing a valid signature at…
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Build AutoCAD UI with AI in 5 Steps | acad-cuix-builder + Agentic skills
Adding a custom UI to AutoCAD traditionally means using the CUI Editor or the AutoCAD CUI API (AcCui.dll) — a manual process that is verbose, easy to get wrong, and requires reloading the customization file every time you iterate. Meet acad-cuix-builder, an agentic skill that skips all of that: it builds a complete .cuix file…
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AutoCAD 2026 .NET 10 Update Beta Preview is Now Available
The AutoCAD 2026 .NET 10 Update Beta Preview is now available for developers through the Autodesk Feedback Portal. This preview introduces support for .NET 10 in AutoCAD 2026. This is a breaking update delivered during the release cycle, which is not something we have done in the past. The main reason for this update is…
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Agentic Skill for ARX Project Creation
The ObjectARX Wizard is the go-to starting point for AutoCAD C++ plug-in development — but it only works with Visual Studio 2022. When we tried to bring it forward to VS 2026, we hit a wall: VS 2026 dropped the VsWizardEngine the wizard depends on (MS Developer Community #11071541). Rather than working around the broken…
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Building a Signed AutoCAD OEM Installer — Avoiding ODIS Error 15
If you ship a product built on the AutoCAD OEM platform, you eventually have to produce a distributable installer, get it digitally signed, and make sure it installs cleanly on a customer machine. Simple in theory. In practice, one mis-ordered step can silently break the signature and customers may hit Error 15 during installation with…
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The Story of ScriptPro+ Modernization
ScriptPro+ has a rich history within the CAD community. It was initially written as a “Plugin of the Month” over a decade ago by Virupaksha (Viru) Aithal. I later expanded its accessibility by creating an MSI installer using the open-source WiX toolset (available here). The Push for Modernization Starting with AutoCAD 2025, AutoCAD migrated to…
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