InstallAware

I have already purchased and installed InstallAware 7.

Can I install InstallAware 8 (trial) on the same build machine?

Will they run without interfere each other?

Actually you will not be able to install v8 with v7 side by side - the new version will automatically remove the old version (with your approval of course), before letting you proceed with the main install phase. Try to use virtual machines if you'd like side-by-side functionality...