If you want, I can draft a short email to Careueyes support requesting a discounted or complimentary license (include your role—student, nonprofit, etc.—and any details you want added).
Windows 10 and 11 have a built-in feature called "Night Light" that reduces blue light for free. Careueyes Free License Code
If you already own a license and need to manage it, the following official CareUEyes tools can help: If you want, I can draft a short