First of all that is Good Work! You should be proud.
There’s a couple of problems with the software link you provided.
- It’s not the current version. The current version is Siemens/Signia Connexx8.4.2/SiFit8.4.26 for newer/current. Though, for Connexx 8 the Updater feature can be used to update older versions.
- It’s the wrong database (HTFit/Hansafit/Hansaton) It should be the (SiFit/Siemens) database.
You don’t have to search the Internet for Connexx software. The links are available here in this forum.
Click this link;
How to find Fitting Software to Program Your Hearing Aids [DIY]
Also scroll down to the Connexx section of that link to read about the various databases.