http://bugs.winehq.org/show_bug.cgi?id=57537
--- Comment #7 from Mathias winebugs@ftzmail.de --- (In reply to Andrew Nguyen from comment #3)
Created attachment 77635 [details] Hack to disable msi UI handling of INSTALLMESSAGE_PROGRESS messages
If I hack msi to suppress sending any INSTALLMESSAGE_PROGRESS messages, then the installer appears to complete successfully. As far as I can tell, the application starts successfully when I launch the SSE.exe executable from its directory.
I can confirm the patch as a workaround with recent wine:
wine-10.15-234-g7fb9d22a793
The installer Win-SteuerSparErklaerung_30.37.55.exe completes successful and the ELSTER-interface is functional.