Legacy Serial Number MIA - SOL?

Question

I've been a PageMaker user since 1.0a (uh, that'd be 1987). Subsequent versions of PM came with a "lite" version of PhotoShop. PMx had PS2.0 LE. PM6 had PS 3.04 LE. PM6.5 had PS 5.0 LE. They were all I needed since I also had Corel Paint and Draw through the years.
I'm semi-retired now and mentally locked in to PageMaker after all these years. So, no, I don't need InDesign. What I do need is to replace my existing PS 5.0 LE because every time it fires up, it shuts down my sound card. And then I miss all the little jingles that keep my head from falling over on my desk asleep.
So, my obvious solution is to go back to PS3.04 LE on my PM6 disk. But of all the thirty or so serial numbers for all my software, that's the one that's missing. The box or sleeve after 17 years, yeah, forget that.
Any ideas on how to hack a legacy serial number?
I've got the s/numbers from PS 5.0 and PS 2.0 and my PM6, 6.5, and 7. And all my manuals and original disks. But after all these years, and almost a decade and a half of being out of warranty, I no longer have any receipts proving ownership. The only thing I have is a statement transferring ownership of the software to me by the chairman of the company I retired from. (They weren't re-hiring an ad man. Guess I broke the mold!) I was the only user through all the years and it was worthless to them after I was gone. Plus, they needed to make me happy. 
Going through Adobe channels is going to get me nowhere because the software is too old and I can't produce a BestBuy receipt anyhow. I'm sure the programmers built in a secret install password ("CorelBites" or maybe "BytesDoItOneAtATime" or something).
This probably has no answer, but I thought I'd try.
If I were writing software, I'd certainly have built in a supersecret universal serial number.
Thanks.

Answer 1

Oh, not forward at all. Like my thinking, probably!!
Short answer:
Why spend the 100 bucks I don't need to? It's not a lot, but maybe a 100 means more to me than you.
Long answer:
1. I enjoy the challenge of making old software continue to be productive.
2. I don't use 20% of the features of my decade-old versions of PS, Word, Excel, PM, whatever. Why buy newer versions with even more great features I don't need?
3. I was, and am, a creative guy. There's always 2-3 ways to do things on computers. I don't need a super new single macro key set to do all kinds of things thus easing my (semi-retirement) workload.
4. I've already got the software and I've still got the hundred bucks.
5. The "cascade effect." Every time you do an upgrade that you don't absolutely have to, you open yourself up to a whole plethora of potential incompatibilities, archive file conversions, forced updates, OS updates, driver mis-matches.
6. I've got CorelPaint, a professional version and use that for some things, particularly anything CMYK. But for most things, a lite edition of PS is quicker for me.
I've been computing for thirty years, and on PCs for 25. I will upgrade given a very strong case for doing so. But last time I spent over a hundred bucks on an upgrade, it was for Office 2007 a couple of years ago. Waste of money. Only thing I got out of it was peer version compatibility with a client. After two weeks with the new interface, I degraded back to 97. I already had ten years invested in being able to work fast and efficiently in 97. Didn't need to go learnin' no new geography to continue productivity.
I do graphic design and copywriting and have even created Windows fonts that people are still licensing. I already have everything I need to continue doing that. I don't need to send files to a smart phone and archive in the cloud and check in with Facebook in the shower.
A lot of this new stuff out there is to just keep getting people to send in their hundred buckses!
Re-reading myself here, I think I may paraphrase as, "Me thinks me doth protest too much!"
= Tom