How can I get rid of Project Manager Plus?

How can I get rid of Project Manager Plus?

I decided to try Project Manager Plus a short while ago, but found that it didn't meet my needs. When I tried to delete the app, I was met with an error message saying that I was unable to do so and to try back later. How can I get rid of this app? Also, when I installed Project Manager Plus, two applications were installed: Project Manager Plus, and Project Manager Plus 6.0.