Is there any conflict?
A colleague of mine (think he has an account on here as dcraggs now) has got them both running on the same machine just fine, I believe.
Certainly would be a huge own-goal from Embarcadero if installing D2009 broke an already-installed D2007, given the way that the components and DCUs are not compatible - I suspect a fair number of people will need to have both around for a while (some of us still need D5 and D7 too!)
I did D2007 on the same machine as D2006 with absolutely no problems (I was shocked, actually).
I haven't tried D2009 yet, but it should be ok.
This guy had problems though. Hopefully his issues were due to the custom setup he describes in that article.
You should always install the older version first. I tried to install 2009 first and then 2007 but the setup of 2007 failed.
Uninstalling 2009, and starting with 2007 first fixed the install problems.
All new versions of Delphi can always be installed safely /next/ to older version.
Each new version should be installed in its own directory.
If you are going to install multiple versions, always install the oldest version first, and then work your way to the newest.
We work very hard to make sure that all versions of Delphi coexist together. But again, never install one version directly on top of another.
Yes - as Rob said (Robsoft) I have both working here. Delphi has always been very good at co-existing with other versions.
Obviously you can only have one version as the default for opening Delphi files.
Moving along with the order of release is a must. Install older first. Uninstalling may get tricky though. How to fix Delphi 2009 data explorer?