Last year we upgraded WPTools from version 4.11e STD to 4.23 PRO.
However, our application doesn't seem to cope with 4.23 and as far as we can see, the problem has emerged because of changes in the engine code.
We'd like to compare the engine-code for 4.11e and 4.23. Based on that we hope to find a way to change our own application code so i works correctly with WPTools.
What should we do to get the engine-code for 4.11e?
Does it cost an extra PRO-license or is it free when we've purchased 4.23 PRO?