I am trying to find out how many of my website conversions are from users running on 32 bit or 64 bit Windows operating systems. I can't seem to find this in GA no matter how far I drill down. I can get down to Windows users running 7, 8, 10 etc, but not further than that. Is there a way to get this information?
The UserAgent Explanation here should be what you're looking for.
You should be able to filter out the traffic source by filtering through using the user agent.
32-bit Internet Explorer 10 on 32-bit Windows 8:
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Trident/6.0)
32-bit Internet Explorer 10 on 64-bit Windows 8:
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; WOW64; Trident/6.0)
64-bit Internet Explorer 10 on 64-bit Windows 8:
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Win64; x64; Trident/6.0)
Of course that appears to be specific to Internet Explorer
Did some more digging and found instructions on how to use the UA in GA
In the Admin section of your Google Analytics account for the property you are looking to track select Custom Definitions. From there we are going to set up a Custom Dimension to enable a Secondary Dimension for reporting within Analytics Reporting section.
Create a Custom Dimension, name it User Agent with a Scope of Hit and tick the Active checkbox.
Google Analytics Custom Dimension to track 32 or 64 bit operating systems
Add the following to your Analytics tracking code
ga('set', 'dimension1', escape(navigator.userAgent));