As an extension of what Mattz196 has suggested, if there is a specific Port that is used by Flash only, you can use a software firewall to disable, (close) it. However, you can't close 80, 1935 or 8080 without clobbering pretty much everything else you want to do on the internet and I'm sure Flash will use these. So, you will be looking for some other Port which Flash also needs but is not used by any essential protocols or services, if it exists. Adobe support should be able to tell you if you email them. Alternatively, perhaps somebody in here with IT training may be able to help? I can't think of any way you can disable the download so that only Flash from GFB is affected.
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