FreeTDS - hankinsoft/SQLPro GitHub Wiki
General
SQLPro for MSSQL and SQLPro Studio both use the LGPL component FreeTDS. This page how you can use the FreeTDS yourself.
How to configure FreeTDS
The easy way
The quickest way to get FreeTDS running on your system is via homebrew. You can install FreeTDS by using the following script:
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
brew install freetds
At this point, the FreeTDS component is now available on your system.