So, to more specifically answer your question - I think you can likely use the 10.9 - 10.10 driver I mentioned above for your USA-19HS. My serial adapter had been unplugged throughout all of this, so I decided to plug it in - and this crashed the computer! But when it rebooted everything worked! I have not restarted since, and will try that soon to verify that there are no ongoing issues. I restarted the computer, to see if the driver would become loaded, but it was not. System Information:Extensions (opened through About This Mac System Report) indicated that the driver had been found but not loaded. This operation completed and I found the driver in Library/Extensions/ (not System/Library/Extensions where the previous driver had been). But then I tried a custom install of only the KeyspanUSAdriver, unchecking the USAdriverFolder. And it failed with a not very helpful error message. So I deleted the old driver (using Keyspan Serial Assistant) and ran the installer on my El Capitan system. The installer notes that the driver in the enclosed package named "Keyspan Serial Adapter Driver_v4_Mac OS X 10.9_10.10.pkg" will work with many different devices - specifically: I tried several things that didn't help, then on a hunch downloaded their more recent file "USA-49WG-v1-and-v2-Mac-Drivers.zip" that would appear to be specific for the four port converter, but it's not :-) It had been working under Yosemite via the last driver specifically named for it ("Driver for USA-28XG_v2.6.4 (Mac OS X 10.6.x to 10.8.x).zip" on the Tripp Lite site). On upgrading yesterday to El Capitan I found my USA-28XG was no longer recognized.
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