UIPath Software Update

I have been using the Community Edition for the past few months. When I tried using UIPath RPA after a short duration I find that the version has been updated and since then I have been unable to access my previous workflows. The version has updated twice and the RPA logo also has changed. The old workflows are not working.
it shows that the Main.xaml file cannot be opened.
Please let me know how I can work with my old workflows in this current version.

delete the project.json file then re-open your project again.