vbs = Visual Basic Script
This is a script file, so needs an interpreter installed to run (the vbs file basically contains a list of instructions that the interpreter reads and executes). Since your husband is familiar with Visual Basic Script, he can look at the file and follow the instructions manually (there should only be a couple things to add/change).
Windows Script may be installed by default under XP, or included with later versions of Internet Explorer, but AFAIK has always been a separate install under Windows 98. You can download and install the interpreter so you can run vbs files, but you should have your husband check Internet Explorer's security settings afterwards, since there are security exploits with the default settings in earlier versions (which I think MS has since mostly addressed). Manually making the changes from the vbs file would probably be easier, though.
See here;
Microsoft Windows Script DownloadsDid you install the game to the default folder?
If your husband has not already fixed this, there is an easier method in this case which would avoid having to install the interpreter to use only once. A registry file can add or change the registry entries that the patch needs to find the install path. The vbs file would be easier and more user friendly if you had Windows Script installed.
Beyond Divinity registry file - right click and select 'Save Target As'. This file contains the following registry key;
REGEDIT4
[HKEY_LOCAL_MACHINE\Software\LarianStudios]
[HKEY_LOCAL_MACHINE\Software\LarianStudios\BeyondDivinity]
"InstallDir"="C:\\Program Files\\Larian Studios\\Beyond Divinity"
"Lang"="English"
"Version"="1.1"
If you installed the game to the default location, then you can right click on the registry file and select 'Merge' (this is also the default action if you double click it). If you installed the game to a different location, say 'd:\games\Beyond Divinity' for example, you will need to open the file in a text editor, such as Notepad, and edit the 'InstallDir' value. You can right click on the file and select 'Edit'. Note the use of double slashes. With the install location just mentioned, the line would be edited to read;
"InstallDir"="D:\\games\\Beyond Divinity"