This is the default location of your Project Files:
C:\Users\USER_NAME\Documents\Autodesk InfraWorks Models
InfraWorks Projects have two components:
1. *.files folder (Project_Name.files)
2. *.sqlite file (Project_Name.sqlite)
There are two hidden .git file folders in the project that you need to look for:
C:\Users\USER_NAME\Documents\Autodesk InfraWorks Models\
C:\Users\USER_NAME\Documents\Autodesk InfraWorks Models\
Select and delete index files in both of these folders.
If for some reason you can't delete these folders reboot your computer, it could be that some of the “git” processes are still running.
If after deleting the index files the Project still does not work; then delete both .gif folders.
**Important to know: Deleting the .git folders will result in converting the currently open proposal to be the master, and all other proposals including the master will be lost.**