During the install.php I need to fill in the path to the ImageMagick folder on my server. Apparently I don't seem to have te correct path, so I e-mailed my host, but I haven't gotten any response yet.
Is it possible to finish the install.php without filling in the path and adding it afterwards?
yes, just leave it blank at install.
Thanks Casper, I found the post that describes this problem and how to go about it. It worked :-D
Now I have installed it (and tested it as far as I could), which files do I need to delete? I am sure I need to delete the install.php. Are there any more files that I need to remove?
you don't have to delete the file install.php - it can't be run a second time (you're free to try), as long as the install.lock exists in the include folder that the installer created after having run successfully. However, you can delete it, as it isn't needed any more. There are no other files that need to be deleted, but you can get rid of some extra files you don't use - check http://coppermine.sourceforge.net/faq.php#minimumInstall
Joachim