No manuel installation of *.qpkg possible when using German language. When clicking on “install manually” you’ll get a description “how to” but no UI (no input option) to upload and install a package.
When switching, e.g. to English language, everything ist there .
Addendum: I have the UI ("Browse + "Install) when I use the English language pack, but QuTS hero h6.0 beta prevents the installation. Even when “ allow installation of apps without a valid digital signature” is checked. Unfortunately, I was happy too soon