That is correct leave your websites and user data alone. do not remove them. back up your sql database first then uninstall leaving the web site files. then as soon as you finish your reinstall then restore your database and everything should come up in ispconfig. As far as the change log i have not seen anything that said they disabled remote framework. but from the experiences i have had even if it was stated that ispconfig had the framework enabled i never was able to get it to work without recompiling the install.