The following is an abridged version of question asked (via support ticket) by a VOSON user:
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I have been using Voson and NodeXL. I wanted to install NodeXL on my work computer and it is asking me for an subscription key. Do we have to pay this subscription as well as Voson monthly subscription?
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Answer: NodeXL commenced paid subscriptions for the "Pro" version in October 2015. VOSON+NodeXL will only work with the Pro version of NodeXL, since it is not possible to import network data into NodeXL Basic (the free version of NodeXL). So, if you want to use VOSON+NodeXL, you will need to purchase a subscription for NodeXL Pro.
Please note also that is only possible to import graphml into NodeXL Pro, so if you want to export graphml from VOSON and import into NodeXL, you will need a NodeXL Pro subscription to do this.