Every Revit release breaks some add-ins. Since 2025 the reason is usually the .NET 8 platform; with 2027 it is the same platform plus API changes. Here is how to check before you move a project, and how Parapet handles it.
%AppData%\Autodesk\Revit\Addins\2026\ and %ProgramData%\Autodesk\Revit\Addins\2026\ - every .addin there is a tool someone depends on.| Revit | Add-in runtime | Symptom if mismatched |
|---|---|---|
| 2027 · 2026 · 2025 | .NET 8 | “Could not load file or assembly” at start-up; tab missing |
| 2024 → 2020 | .NET Framework 4.8 | n/a for 2027 - needs a rebuild |
Bulk parameter editing + 108 one-click actions. Pro, 30-day trial.
Excel, CSV and Google Sheets ↔ Revit. Pro, 30-day trial.
Find and clean imported CAD. Free forever.
No. One key, every supported version, 2020 through 2027.
Yes - the installer puts the right build in each year's Addins folder; both show the same Parapet tab.
No. Revit LT has no add-in API in any version.
Audit is free; Hub and Link come with 30-day trials, no card.
Download Parapet Install guideRelated guides, tutorials and comparisons.
Which add-ins work in Revit 2026 and 2025 (.NET 8) versus Revit 2020-2024 (.NET Framework 4.8), how to check compatibility, and Parapet's…
Where Revit add-ins are installed, how the .addin manifest works, what to do with the Security - Unsigned Add-In dialog, how to verify a…
A practical guide to Revit add-ins and plugins in 2026: which tools to use for bulk parameter editing, Excel and Google Sheets linking, CAD…