Custom Activities with code, how to setup? (For Legacy)

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Ahhh yes sorry, for the window legacy projects you need that version of the documentation. Did you follow the guide step-by-step? It references .NET 4.6.1 there, selecting it as a framework and adding it as a reference.

The image provides steps to set the Project name and Framework in UiPath Studio along with an important note on supported .NET Framework versions and a link for migrating activities to .NET 6. (Captioned by AI)
The image provides steps to set the Project name and Framework in UiPath Studio along with an important note on supported .NET Framework versions and a link for migrating activities to .NET 6. (Captioned by AI)1153×235 29.3 KB

Btw, you are aware that legacy is being deprecated by UiPath? You will still be able to edit existing legacy project for a while, but it is already recommended to start migrating.