Install DragonBones 5.6.3 [dragonbones.com] (It's free)
If you have difficulties downloading it from the official site here's direct download link:
tool.egret-labs.org/DragonBonesPro/DragonBonesPro-v5.6.3.exe
or Google drive link[drive.google.com]
Download latest release zip [github.com] of Spine Converter for DragonBones.
For older releases check releases page[github.com]
Install Python 3.0+ [www.python.org]
Download latest code zip [github.com] of Spine Converter for DragonBones.
Choose any animation and collect .skel, .atlas and .png files assosiated with the animation in one folder.
Drag'n'drop .skel file onto SpineConverter.exe. You should now have .json file in the same folder as other files.
open settings.json and paste path to file in "filePath" section. You can copy path to file by holding down Option keywhile in right click menu and pressing press "Copy X as Pathname".

Import .json, .atlas and .png files by pressing File -> Import Data and choosing "Texture atlas". Choose paths to your files. Import window example:

After importing you'll see your character:


Do whatever you like with the animation, just don't forget to save frequently.
Animation by Anti:
My examples:

<br>
Export project. Set type to “Spine” and Data Version to “2.1”.
Image Type should be set to “Texture Atlas”.
Your project has to contain at least 1 skin in order to width and height information to be in .json.
Export both Data and Texture otherwise .json will not contain width and height information.
Example of export settings (turn off whitespace striping, will change this screenshot later):


Drag'n'drop acquired .json onto SpineConverter.exe (or change path in settings.json for Mac).
Since DragonBones doesn't support commas in project names script will automatically put commas around word "sprite" in .json, .atlas and .png file names in .json file's folder. Converter will also replace .png file name inside .atlas file.
Example:

Put .atlas and .skel in hero's anim folder. Put .png file in hero's texture folder (don't forget there are multiple color palettes).
Launch DD and test your new animation. You don't need to restart the game. Just go to the main menu and back.
Go back to step 4 if needed.

• Do not name slot(bone hierarhy) and skin(image library) differently, this will cause an error when loading into the game like "couldn't find region"
  
• Don't use characters other than those in English alphabet (you'll see "OverflowError: int too big to convert" error when converting to skel);
  
• Don't try to flip animation by setting scalings of bones to negative values, it will break the animation;
  
• Don't assign multiple images to same slot, if you do you'll get "Can't allocate more objects!" error and game will become unstable
  
• Don't leave empty spaces in your textures which can be cropped otherwise textures will be stretched. Cropping example:

If you run the export then nothing happens, your node.exe is being blocked.

To fix this, go to https://nodejs.org/en/download/ and download the windows 32 bit version. Install it.

Then go to the install location, so typically C:program filesnode.js

Take the node.exe, and overwrite the one in:
C:\Program Files\Egret\DragonBonesPro\egretlauncher\server\win

Big thanks to TheAwkwardHeady and Sherin for figuring it out.

Open .atlas file with Notepad++ and change texture file name.

Don't forget that there are several color pallets for every hero. Change it to the one you've edited.

Use this script [drive.google.com] made by AlienAtSystem#9334. Drag'n'drop png or a whole folder file onto it. If you have questions about this script you can pm AlienAtSystem#9334 at Discord. I'll try incorporate this script into converter one day.

No, game flips them for you. Every animation should face to the right. If you really need to flip something then use Json Flipper[drive.google.com]. Use it the same way as you use Converter - Drag'n'Drop.

Don't forget to change animation's name. Go to animation mode and check bottom right corner. Animation name should be the same as in the file name.

For some reason DB doesn't add Spine version into JSON files, but check for that info when importing something. Open JSON file and add spine version, it should look like this:
{"skeleton": {"width": %, "height": %, "hash": " ", "name": "%", "spine": "2.1.27"},...

• KaoTheCow for creating guide on how to use SpineConverter
  https://steamproxy.net/sharedfiles/filedetails/?id=2129596601
  
• brachna for creating SpineConverter [github.com]
  semgilo for his binary reading code for 2.1.27
  
• Anonymous_Koala for providing repaired heroes' animaions [drive.google.com]

If you have questions you can message me at discord: "monteepoke"