Unable to perform crossbrowsertesting on each browser and OS provided by CBT.

Hi,

I am performing crossbrowsertesting. when i am  executing my script for (window 10 and chrome 73 64-bit) and

(window 10 and chrome 73). It's working fine.

But When I am choosing (Windows 8 and chrome 70) then script failed and post error that

"TestComplete Chrome Extension Is Not Installed or Is Disabled 23:19:15 Normal 21.60"

Kindly check attachment for same.

Also I want to know it's my coding problem or I need to perform any kind of setting.

below are the functions where script mostly failed in crossbrowsertesting, i am using that function in my test cases.

Sub SetUpBrowser
While Sys.WaitBrowser().Exists
Call Sys.WaitBrowser().Close()
While Sys.WaitBrowser().Exists
Aliases.browser.Terminate
Wend
Wend
End Sub

Sub OpenBrowserWithURL (BrowserName,URL)
Dim firefox,InternetExplorer,Chrome,Edge
If (BrowserName="Firefox")Then
Browsers.Item(firefox).Navigate(URL)
Sys.Browser.BrowserWindow(0).Maximize
ElseIf (BrowserName="InternetExplorer")Then
Browsers.Item("iexplore", "11", Browsers.pX64).Run URL
Sys.Browser.BrowserWindow(0).Maximize
ElseIf (BrowserName="Edge")Then
Browsers.Item(btEdge).Navigate(URL)
Sys.Browser.BrowserWindow(0).Maximize
ElseIf (BrowserName="Chrome")Then
Browsers.Item(btChrome).Navigate(URL)
Sys.Browser("chrome").BrowserWindow(0).Maximize
Log.Checkpoint("Browser Name: "&BrowserName)
Log.Checkpoint("URL: "&URL)
End If
Browsers.Refresh
End Sub