If that's your paranoia level: How do you know the "offline" tool you're using is not uploading to a server? Possibly inadvertently in the course of bug reports, or surreptitiously while contacting the license server...?
Should security concerns really warrant not trusting the (reputable) vendor that the files are not being uploaded, you would need to do some sort of audit and/or run in an isolated environment and wouldn't be the "random user" referred to in OP.
Should security concerns really warrant not trusting the (reputable) vendor that the files are not being uploaded, you would need to do some sort of audit and/or run in an isolated environment and wouldn't be the "random user" referred to in OP.