Actually, you can install them on the same machine.
According to Crystal Decisions, in tech article "General Questions and Answers Regarding Crystal Enterprise 8" the question was asked if was possible to install Crystal Enterprise and Seagate Info 7.5.2.0 on the same machine.
The reply was: "Installing Crystal Enterprise and Seagate Info 7.5.2.0 on the same computer is supported. However, Seagate Info 7.5 should be installed first, followed by Crystal Enterprise"
We installed Seagate Info 7.5, then CE 8.0 with no installation errors. I tested whether I could use CE and had no problems. No problems encountered when I published a report, logged on CM as Admin or Guest and I also had no problems with ePortfolio functionality.
Another person tested Info functionality and he said he didn't encounter any problems with Info functions.
Karen