A professional diagramming tool that helps users visualize complex information through easy-to-understand diagrams.
Yes
Here is link to buy standalone Visio.
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On the right side of the page are links for Phone/email support. Ask them how you would do an Offline purchase, install and activation.
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It would be easiest if you could connect to the internet to do the purchase, install and activation. Arter that you could run disconnected.
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If this purchase works like other Office products, which I ****-ume it does, then when you go to the link and chose to buy it it will require you to provide an email account to associate the license with. It could be a generic corporate "admin" account rather than a personal account.
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After the license is purchased, you should be able to download an "Offline Installer" file which you would run on the disconnected computer.
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After the install, you would do a phone activation.
The problem with this suggestion I have is that phone activation requires a product key. I don't know if the standalone purchase will give you a product key.
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After the purchase, please post a reply with process you had go through to make it work.
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Here are a couple of links on how to download offline installer. I'm guessing you will have to use the "business" one since MS considers Visio (and Project) to be "business" apps.
Offline Installer
Business subscribers need to use the ODT to get the files to install offline. Use the Office offline installer (microsoft.com)
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Family and Personal can download the offline file.