There is no information about this matter on the Internet. The latest version of the application is 6.3. Because of this, the developer might have discontinued the support for the version 2 and you are not able to obtain an activation code for it. In this matter, try contacting the developer. Only he can provide additional information about this matter and maybe an activation code. You can do this by mail :
firstname.lastname@example.org or by phone :
+385 51 545 880.