Daedalus is not working
The blockchain is 6 Gb on disk as of August 2019 if you do not have enough disk space for it to run it will stop working. Also, you may have problems with other applications if you do not have enough disc space.
For both Windows and Mac there are many ways to create space on your computer.
Two simple ways are:
1. Empty the trash. If that does not work,
2. Find and delete large files if you have any like unwanted movies or software installables. Don’t forget to empty the trash after you do this.