Install tool causes PHP warnings if typo3conf/ is not writeable
When running TYPO3 right after downloading it (e.g. the 4.4 introduction package) and you didn't set the right file permissions, you'll get PHP warnings when trying to use the install tool.
Download the packaged TYPO3 4.4, unpack it and access it through its base URL, e.g. http://myhost/.
(issue imported from #M14980)