Learn Hardcore Turkish: Uygulamayı güncelleyip duruyorsun.

It expresses repeated or persistent action, often with a hint of annoyance or complaint. So Uygulamayı güncelleyip duruyorsun ≈ “You keep updating the app (again and again).” It’s stronger than a plain progressive and suggests the action happens repeatedly.

But doesn’t durmak mean “to stop”? Why does it mean “keep doing” here?

Outside this pattern, durmak can mean “to stop/stand/stay.” In the construction V-ıp durmak, it functions as an auxiliary meaning “to go on doing, to keep (repeatedly) doing.” Think “remain in the state of doing X again and again.” It does not mean “to stop doing X” here.

Why is it written güncelleyip and not “güncelleip” or “güncelliyip”?

The converb is -ip/-ıp/-up/-üp with vowel harmony. When the verb stem ends in a vowel, you insert the buffer -y-: güncelle- + -yip → güncelleyip. Writing “güncelliyip” is incorrect.

Can you break down the whole sentence morphologically?

Uygulama-yı = application + accusative (definite direct object)
güncelle-yip = update + converb (-ip) with buffer -y-
dur-uyor-sun = stay/keep + present continuous + 2nd person singular Overall: “You keep updating the app.”

Why is the object uygulamayı in the accusative (-ı)?