The system requirement for Revit state 5 GB is required
However when i try to installl Revit the required disk space is actually 32.8 GB
Why is this??
I had the required 5 GB free to download Revit
In Revit 2013, the disk space value was not immediately updated as content packs were enabled or disabled. This value was only updated after the Revit 2013 product entry was collpased. My recommendation would be to start the installation again, expand and collapse the Revit 2013 entry and then you should have an accurate disck space estimation. If the required amount of disk space is still too high, your best option is to expand the Revit 2013 entry and disable the installation of content packs that you don't need.
Tony Michniewicz
Autodesk Revit QA