'<=== This gate-keeps the entire section between If and End If. Only if the o/u tab is visible should the code below, between If and Else be executed. If you cannot see an O/U tab then code should go direct to Else part.

If .document.querySelector("#bettype-tabs li:nth-of-type(5)").getAttribute("style") = "display: block;" Then    '<<<<< o/u tab visible

    .document.querySelector("#bettype-tabs li:nth-of-type(5) span").FireEvent "onmousedown" 'over/under '<==switch to o/u tab

    Do
    Loop Until .document.querySelector(".table-chunk-header-dark").getAttribute("style") = "display: block;"  '<==wait for o/u tab to become dark shaded

    .document.querySelector("[onclick*='P-2.50-0-0']").Click '<==click desired option

    While .Busy Or .readyState < 4: DoEvents: Wend

    Dim oddOver As String, oddUnder As String

    Set averages = .document.querySelectorAll(".aver td")
    oddOver = "'" & averages.item(2).innerText
    oddUnder = "'" & averages.item(3).innerText

Else '<================================================================================o/u tab not visible
    oddOver = "No odds"
    oddUnder = "No odds"
End If