Help one question only…
Why is https://sparkleapp.de/ until today on version 4.5?
Thx
Hello and welcome to the community 
To my knowledge, only the main website (sparkleapp.com) has been updated for the release of Sparkle 5. The other sites still mention Sparkle 4.5, but when downloading Sparkle, it should be Sparkle 5 that is actually downloaded.
Sorry we haven’t gotten around to it yet, hopefully coming soon.