I am a dinosaur, and I absolutely depend on DEVONnote for my life! I love the .rtf storage files. I can edit them in a text editor to create new templates to use. I have about 5000 notes collected over the past 10 years. DEVONthink has much more than I think I would ever need.
My question: has anybody tested DN on Big Sur? I cannot afford to upgrade to it if it will fail to preserve my stuff.
Thanks 
DEVONnote was officially retired well over a year ago. I would not suggest continued use going forward.
The Standard edition of DEVONthink 3 should provide you the same functionality (and more).
In DEVONnote, you can use the File > Export > Files and Folders command and export to a newly created folder on your desktop. You could then use File > Import > Files and Folders in DEVONthink 3 to import these files.
Thank you very much. and I am going to copy that post to my DEVONthink note in DN for future reference, but I will probably ride this horse until I upgrade to a stable Big Sur, and when M1 has been out a year, hopefully supporting 32GB RAM and I get a new MacBook Pro.
I find the C++ search thread disappointing though. I am well versed in Regular Expressions, and would not expect this behavior from such a sophisticated product, alas. I frequently have to resort to EasyFind for some of my current searches.