Hi there! Sorry to hear you're having trouble downloading in Dragon Mania Legends with that weird "need 0.00MB of free space" message followed by a crash. Let's get this figured out together.

First, a couple of quick questions to understand better:
- Are you trying to download the game or an update within the game?
- Have you checked your device's actual available storage space on your Windows system?
- Does this happen every time you try to download something in the game, or just occasionally?

Meanwhile, here's a step-by-step plan to try fixing it:

1. Check Your Disk Space:
Open File Explorer and check the free space on the drive where the game is installed (often your C: drive). You should ideally have several hundred MBs free for smooth operation. Even though the app says "0.00MB," the system might be misreading your space.

2. Clear Temporary Files:
Sometimes leftover temporary files can cause problems. On Windows 10:
- Press Windows + R, type %temp%, and press Enter.
- Delete as many files as you can (some might be in use and can't be deleted, that’s fine).
- Then go to Settings > System > Storage and run Storage Sense or clean up unnecessary files.

3. Restart Your Computer:
A simple reboot often helps clear minor glitches.

4. Run Dragon Mania Legends as Administrator:
Right-click the game icon and select "Run as administrator." This ensures it has the right permissions to write data.

5. Update Your Windows and Graphics Drivers:
Make sure your system and display drivers are up to date, as old software may cause issues.

6. Reinstall the Game If Needed:
If none of the above works, backup your game progress (if possible) and reinstall Dragon Mania Legends fresh. Sometimes corrupted files cause these errors.

Try these out and let me know what happens at each step, and if you’ve already tried any, do tell me! We’ll get this sorted.