I appreciate everybody's help. Thank you! All the more frustrating it is that nothing whatsoever works. I had, of course, also tried to install directly from CD. That was in fact the first thing I tried. This, as well as all subsequent attempts to get a different CS4 download, ultimately led to the same error: an unrecognized serial number. Following up on what Jeff had written, I moved through the trouble shooting tips in Error: "The serial number is not valid for this product" | Adobe Creative Suite and removed the Adobe PCD folder and the caps.db file, which were described as potentially corrupted. Well, that I think broke it completely, since now the installer doesn't even get to the point of asking me about the number. I guess I should first have tried that other tip of registering for a trial and then afterwards typing in the number. Unfortunately, now I'm stuck, because my attempts to exactly recreate the removed folders as they were failed, and now I can't even coax the installer into priming me for the serial number. It's somehow weird that an installation would require pre-existing folders in my own directories in order to run. How would Adobe folders get there before I have bought DWCS4? This is sadly taking forever, and I don't have so much time. My desperate attempts to resuscitate DW have been taking up more than 95% of my entire migration efforts time---absolutely everything else ported smoothly, but of course there were newer versions, so that's not all Adobe's fault. But I have numerous webpages that I have created with DW, and if I can't revive it, or some successor at an affordable price, that basically creates a huge mountain of work for me, namely, redoing all these webpages with a different product. I would really really like to avoid that, but I'm getting close to the point where I simply see no more way out.
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