Well, since OldVersion doesn't provide retail versions of commercial software, even if the company doesn't exist anymore, I guess your best bet is to look for it on eBay and such ...
Program Name: Spec Plus or Specification Plus by 2020 Technologies
Website: unknown
Current version: no longer sold
Desired versions: any was sold approx 10 yrs ago
Description: this is a design specification software for office furnature. We have many files that were created with this software but no copies of the software and we are in a pinch to open a few of the files up.. any help would be greatly appreciated. THANK YOU
Well, since OldVersion doesn't provide retail versions of commercial software, even if the company doesn't exist anymore, I guess your best bet is to look for it on eBay and such ...