Rob,
Any new BSV that you make has a menu called Standard in the Visual Perspective (VP) called Administrator. I do not change this as it will allow for easy posting of new BSV versions.
In general, the way to post a new BSV is to login to the application using a User Name & Password that is assocated with the Administrator VP.
Then select Standard | Upload Version. You will then be prompted for the BSV file & any description you want to provide for that version.
Assuming you remote into their LAN, you should be able to just open up a browser & login as described above. No need to open up the AwareIM configuration tool.
If you are not able to Remote in, but instead have someone else on their LAN that would have appropriate authority to upload a new BSV, you could email them the new BSV & they would follow the same procedure by opening up their browser & logging in. In fact, you could design a VP for them to log into that would only have 1 option -- to upload a new version of the BSV.
As far as security, it will be as secure as your control over passwords, etc. If you want to really go crazy, you can monitor the IP address of the users that login & only permit people with predetermined IP addresses. You can also set up passwords that expire after a certain amount of time or a certain number of uses.
Tom