Changes

The "Script path user" credentials are used to gain access to the network share where the wpkg.js script and the configuration xml files are located. A directory to hold installation files is often also placed in the same share, as shown in the example below. If the share is set up to accept guest read access from anyone, then these credentials may not even matter.

The "Script execution context" user is the user that "executes all commands". This user probably has to have administrative privileges on the local machine to be able to do most interesting installs. By default, WPKG-install sets this to SYSTEM(no password needed), which works fine as long as the installs do it does not have to access other network shares. If any of your installation scripts require access to network shares (other than the share where the script and configuration files are) then you can set this to a user that has administrative privileges on the local machine and also read (or read/write) privileges on the necessary network shares.