If you do not have a paid license for Microsoft Visio 2013, you can use these powerful and completely free diagramming alternatives that require no activation hacks:

To tell the system to use KMS activation, you must input the Generic Volume License Key (GVLK) for Visio 2013. Run the following command: cscript ospp.vbs /inpkey:KF958-3S3GP-YV69P-F898Y-G77G2 (Note: Use the key specific to your version, such as Visio Professional or Standard). 4. Set the KMS Host Machine