: For Revit 2015, the standard product key is 257G1 .
: Newer subscription-based licenses for legacy products often require signing in with an Autodesk ID rather than using an activation code. Finding Your License Details If you cannot find your activation info: Revit MEP 2015 student license problem - Autodesk Community revit 2015 activation top
In terms of speed and offline functionality, yes—it works instantly without an internet connection. However, it is not legal for commercial use. Antivirus software will flag it as a hacktool (which is technically true). Use only on legacy systems with expired educational licenses. : For Revit 2015, the standard product key is 257G1
: Most users can use the "Connect now and activate!" (automatic) option, which communicates directly with Autodesk servers. Common Troubleshooting for "Repeated Activation" : For Revit 2015