Which one is correct to say?
"You are having incorrect installer."
"You have incorrect installer."
You have the incorrect installer.
Have is not an action in this sentence. It is a state or condition.
possess, own, or hold.
"he had a new car and a boat"
When a verb describes a state or condition, we usually don't use the verb with -ing.
You can search for "stative verb" to find more information, or see, for example, this discussion of stative verbs on perfect-english-grammar.com.