Which ZWO have you ordered Graham ?
SharpCap ( free) works natively with all the ZWO hardware. I'm now running the 1600mm-c with an EFW and they just appear on the menu to manage cooling temp, filter selection and all the imaging options.
The OSC's normally come with a clear glass window to protect the sensor although they may include an IR cut as well now. I had to buy mine for the 120mc but that was a while ago.
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