Since I created WRT settings there weren't too many versions. It is as simple as it gets - you have list of name value pairs, formats are well defined and that's it.
However, Iv7777 found an issue in way how encryption works for AsusWRT v2 configuration format. He has a bit longer explanation in addition to his fix. Short version is that some random values are not working properly with Asus' configuration file encryption. Leaving aside discussion on how useful this encryption is in the first place, I give you new version with this correction.
In addition to this major issue, there is a bugfix for handling empty DD-WRT files and program has been upgraded to use .NET Framework 4.
As always, new version is available either from application itself or from project's page.