R – IE goes blank when it the activex is downloading for the first time

You could unregister the control with

regsvr32 /u badboy.ocx

at the command line. Though i would suggest testing these things in a vmware.

Try the javascript delete statement:

function unloadObject(objId) {

    var obj = document.getElementById(objId);

    obj.parentNode.removeChild(obj);

    delete obj;
}

Call unloadObject(targetActiveXTagId) before opening your second page.

Ideally, you should build the upgrade mechanism into your ActiveX itself. I've seen several online game platforms does this with good results.