Well, I'd already bought the CANbus pod from Total Phase, and in the wee hours of the last business day of the year I just ordered the EAGLE upgrade - 1 seat, professional, from v5 to v6 - turns out it's $549 for the upgrade; with the compulsory donation to the Glorious People's Republic of California, it ends up being a few cents under $600, which is rather steeper than I'd expected, right around twice what the v4 to v5 upgrade cost three years ago.
Ah, well. There's a reason I have the professional edition: I put it to revenue use on a fairly regular basis. Doesn't take much of a project to pay for the software upgrade, though, thinking more objectively, it'll probably take quite a while for the feature enhancements to save enough of my time to pay for it.
It does look like I'll be needing to run a split environment for a while, as there's no "save as v5" capability, and I need to maintain the toaster-controller designs in legacy format so's the client can deal with them (though actually the "run as freeware" option seems to allow full read access, just not modifications outside the freeware limits). Meanwhile, I should be converting my other designs, and my library, to the new format and making use of the new capabilities - hey, look, arbitrary pad shapes!

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