if you can get an error message to show it, at the bottom of the page you will find out which version of the framework is used.
or, if you can download the file, you can load the aspx page containing the code to display the frame version:
<%@ Page Language="C#" EnableSessionState="False" EnableViewState="False" Trace="False" Debug="False" %>
<script language="C#" runat="server">
protected void Page_Load(object s, EventArgs e)
{
Response.Write(System.Environment.Version);
}
</script>
it was just introduced, there may be syntax or other code errors.
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