https://forums.autodesk.com/t5/installation-licensing-forum/inventor-2016-prdsu-cannot-find-cab-file/m-p/5599521#M144272 That could impact things if your internet is a little flakey as you say. Still worth a try downloading via browser download through the night rather than whilst your working. Mon, 20 Apr 2015 11:02:11 GMT ukdxb012 2015-04-20T11:02:11Z