Thanks to all for the suggestions. As luck would have it, when I returned home from the office I found a 10.1 install kit on a backup drive and I was able to make that available to the current environment and use it to perform a successful clean removal of 10.1 after which I was able to install 10.6.1 successfully. So, now I've just got to get the integration working (for which I think I'll have to adapt our purpose built extension). Thanks again for the sugggestions (which I did read through). Cheers, Mick
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