AS IO Full Application - Appian Onboarding Application

Hi together,

I tried to implement "AS IO Full Application" aka "Appian Onboarding Application".
 https://docs.appian.com/suite/help/21.4/io-21.3.3.4/appian-institutional-onboarding-home.html

This thing feels broken as hell.
My main issues currently:

1.) We got an error message which is referring to a not available function. no plugin i know, can provide this function. ('loadbundlepropertiesfilemultifolder')
"Expression evaluation error [evaluation ID = 2a107:24de2] in rule 'as_co_i18n_ut_loadbundlefrommultifolder' (called by rules 'as_io_ut_loadi18nbundles' > 'as_io_fm_landingpage') : The function 'loadbundlepropertiesfilemultifolder' is unavailable." 
There is a package out there with a similar function. 
https://community.appian.com/b/appmarket/posts/load-resource-bundle 
This i definied as precondition so it should be fine.
But yeah. similar.



Has anybody already dealt with it so far or even a working version?


FYI: I mailed Appian support and opened a cases already.

Kind regards,
Richard