I just recently downloaded and installed the latest version of Unity, 2020.1.2f1 and was met with a rather interesting surprise, one that I am definitely happy about. It would seem that in this version of Unity, the Professional (DARK MODE) skin is now available to everyone.
If you look through the Change log for the release you will notice the following.
Changes
- Editor: Dark Theme editor preference is now available to all users.
For someone who has vision issues. this is a big plus and a step in the right direction. It definitely does make the editor more accessible to people.
So a Big thank you to Unity for this.