When using the SOLIDOS program, certain commands require a license.
See the topic Commands. Those commands with a red asterisk require license validation.
You can log in by clicking the command SOLIDOSABOUT in the command line and, after reading the message on this screen, clicking the "Yes" button.
If you do not log in, the program will not validate the license and will work in demo mode, with restrictions.
You can ignore the message by checking the "Don't show again" box in the lower left corner of the screen.