There is no file upload or stuff like that. Go to your control panel, under the Goodies select One-Click Installs and select activeCollab from the list. You will be offered to create a new database or to select an existing one. When you submit the form you'll receive an email with the instructions how to set up an administrator account and provide your company details.
This is really great because it will bring activeCollab in front of the users who just want things to work, not to hack their way around.
Thanks to Dreamhost for this move!
If you have something important to say about the issues discussed in this post please write at hi@a51dev.com.
My site is at DreamHost so you can be sure I’ll be installing ACollab immediately!