Hi Pablo,
Looking at your log it says at the top:
| BeagleBoard.org Debian Buster LXQt Image 2020-05-18
So it seems you are using the LXQt Snapshot, rather than the “Debian Buster IOT Snapshot” which is linked just below it on that page (and is I believe what is specified in the Chi.Bio software manual). I think if you install the IOT snapshot there should be plenty of room on the device.