Worked for me first time. However, I can understand the annoyance of other C4D users that did not enjoy the same good fortune.
It is very poor that the moderator makes threats when people complain of valid problems - that is the idea of a forum not simply to write how good Maxwell is.
Interesting to see other application specific sub forums are not reporting the same problem of installing Maxwell.
It is now 2007. I was having to mess with environment variables back in the 1980's. I would not expect to do so today.
If the moderator cannot accept that people are justified in being annoyed when something does not work correctly then perhaps it is the moderator who should stand aside?