If you change the Unreal Engine version, any remaining old built files may cause the build to fail. Please try the following steps:
- Terminate the Unreal Editor.
- In your UE project folder, delete all folders of names “.vs”, “Binaries”, “Build”, “DerivedDataCache”, “Intermediate”, and “Saved”, if any (along with all files and subfolders in them).
- If your UE project folder contains a file of name “<project name>.sln”, delete it, too.
- If the folder “Plugins/StrixSDK” contained subfolders of names “Binaries” or “Intermediate”, remove them, too.
- Open the project with Unreal Editor. If you see a message to confirm a rebuilding, allow it.