In what way is this library "designed specifically for Windows 64-bit systems" ?

Also I recommend against committing zip files (and other release binaries) into your repository as it will blow up the repository size when you do updates.
Does Codeberg not support release artifacts?

I don't really understand why you put this on patchstorage.com .. since you are not sharing any patches here.
The zip file contains some screenshots. Seems to me that there are better ways to share those ..

Start by reading the manual? -> https://github.com/pure-data/deken/tree/main/developer

This is absolutely insane

You don't need the [+ 1] if you do [sel 0 1 2].

Also this [$1 20( is completely unnecessary.

Sidenote is that number-boxes turn into [f ] objects in the Heavy compiler which are like a number storage (that you can store and retrieve values from). If you have a lot of them they will add to the total program memory of your project.

The externals. It's debatable whether or not the patch that loads these externals would also fall under this license. I would say it doesn't, but if you use abstractions that are GPL you could argue that it does.

Definitely take care with license issues when distributing someone elses code. This kind of due diligence is often omitted and can cause issues down the line.

@porres said:

etxernals will use GPL, which won't allow you to sell.

This is not how the GPL works. It allows commercial use so you can definitely sell any such products.
However if you are distributing these products to users they have the right to see the source-code (as per the GPL).