hey guys, i currently use the revit architecture 2011 version, i had a prior installation of 2011 on my laptop however for some reason it could no longer detect y license so i uninstalled it, then downloaded the same version again, this time a different serial number was distrubuted. The program works fine, however whenever i attempt to open the file at my schools computer in thei 2011 version, i try to save, it states "file not saved" so i then save it under another name and it states that that "the file ect was saved in a later version of revit and cannot be retrieved in this version" how is this possible when the version i initially used is from revit 2011???
