steps to reproduce:

1. ASSERT: make sure that you have VirtualBox 5.1.X installed
2. EXEC: launch platform installer, log in, get to components selection page
3. ASSERT: installer complains that Virtualbox 5.1.x is newer than the required 5.0.x, you cant continue
   
4. EXEC: dont close installer, uninstall Virtualbox in the background
5. ASSERT: installer wont notice the uninstall, which is kinda expected
6. EXEC: hit "Back" and get back to the component selection
7. ASSERT: Component checks are executed.

Result:
Checks are executed again, but the installer still complains that VirtualBox 5.1.x is installed and newer than the exepected 5.0.x version.