Hi there
The two versions nicely exist side by side. No need for
worries there. As long as you don't touch live work with 8, you
should be fine. Create a new project or make a copy of an existing
project to test with.
Oh, and if you are accustomed to opening projects by
double-clicking the project file from Windows Explorer, well...
See, the install configures the file association so that
project files are now associated with the new version. So if you
attempted to open an older version by double-clicking, 8 would open
and attempt to work with it. But that's just the nature of Windows
and the way it works with software. Not a shortcoming of 8.
Cheers... Rick