Some new and changed features of Revit LT 2026 result in certain behaviors for upgraded models. Review this information before upgrading your models.
Migrate CefSharp to webView2
All CefSharp binaries are removed from the Revit LT distribution package starting with Revit LT 2026. Revit LT add-ins, can continue to use CefSharp as a standard 3rd party component. To continue using CefSharp, please ensure your add-in includes CefSharp binaries. Autodesk recommends using webView2 as an alternative to avoid potential issues from different CefSharp release versions in a single Revit LT session.
It is possible that WebView2 will not initialize in some cases. This may cause user interface elements to be gray or empty. For additional information see: Troubleshooting: User Interface Component Gray/Empty
Improved accuracy when linking topography
When reloading topography linked in previous versions of Revit LT, the improved precision of linking may result in topography that more closely aligns with the geometry of the link. In some cases, you can successfully link topography that was not previously possible. See images below for example.
Source file to be linked
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Before accuracy improvement |
After accuracy improvement |
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Sub-Division Upgrade
- Inherit Contours - This is now controlled directly by the toposolid type used by the sub-division.
- Material - This is now controlled directly by the toposolid type used by the sub-division.
For additional information see Toposolid Sub-division Enhancements and Sub-divide a Toposolid.
OmniClass Parameter
The OmniClass Title parameter has been renamed Classification Title. The OmniClass Title parameter value will be lost after upgrading to Revit LT 2026 if the default ClassificationTaxonomy.txt is used. To retain the OmniClass Title parameter value, define the ClassificationTaxonomy.txt according to OmniClass standard before upgrading. See Edit the Classification File.