Possible keys that can be changed are found in the file in this folder:
 DebtAversion.exe.config

This doesn't yet change the preferences to the application.

The application stores actual preference settings in path similar to
C:\Users\UserName\AppData\Local\DebtAversion\DebtAversion.exe_Url_xgmbtror2eugea50wquemqd3hvp3cjlh\1.0.0.0

Easier is to first remove the old version settings If they exist.

Reflect possible settings from the DebtAversion.exe.config from this folder
to the file inside AppData\Local...etc. For example to change amount of years or rounds to 5 add lines

            <setting name="years" serializeAs="String">
                <value>5</value>
            </setting>

[Toni Sanio @2015]