First time fix

hi, Anonymous 

You could try this formula to get your requirement:

Measure 2 =
VAR nextcreatedate =
    CALCULATE (
        MIN ( 'Table'[ST date created] ),
        FILTER (
            ALLSELECTED ( 'Table' ),
            'Table'[Installation number] = MAX ( 'Table'[Installation number] )
                && MAX ( 'Table'[ST date closed] ) < 'Table'[ST date created]
        )
    )
RETURN
    VAR days =
        IF (
            nextcreatedate = BLANK (),
            DATEDIFF ( MAX ( 'Table'[ST date closed] ), TODAY (), DAY ),
            DATEDIFF ( MAX ( 'Table'[ST date closed] ), nextcreatedate, DAY )
        )
    RETURN
        IF ( days >= 90, "First time", "No" )

Result:

Best Regards,

Lin