Not a problem. Just make sure each is installed in separate folders, and
make sure you don't have the "remove previous version" checkbox checked.
It's generally advised to install them in chronologically order (i.e.;
install the oldest version first), but even that's not essential.
Just install them in increasing version order, and install each one in
its own directory; use the Custom install option to override
Installer's attempt to overwrite the prior version.
