This is the 2007th most frequent German word.
installiert
"Installiert" means "installed."
Here, 'installiert' is part of the present perfect tense utilized in describing a completed action in the past (installing).
Ich habe gestern die neue Software installiert.
I installed the new software yesterday.
In this case, 'installiert' is used as the past participle in the passive voice, indicating that installation is an ongoing action performed by an agent.
Das Programm wird gerade auf dem Computer installiert.
The program is currently being installed on the computer.
Here, 'installiert' acts as part of a predicate adjective describing the state of installation of the application.