The ConvertFrom-SourceTable script can be installed from the PowerShell Gallery:
Install-Script -Name ConvertFrom-SourceTable
As it concerns a standalone script, installation isn't really required. If you don't have administrator rights, you might just download the script (or copy it) to the required location. You might than simply invoke the script using PowerShell dot sourcing:
. .\ConvertFrom-SourceTable.ps1
For source code versions, testers history etc., see the ConvertFrom-SourceTable project site on GitHub.
My name is Ronald Bode.