Icons are copyrighted by Axialis SA, but they are licensed under Common Creative (Free, Limited with Attribution) license. In short:
Icons can be used freely in commercial and personal projects. However, only limited versions of the icons can be used and Axialis require a copyright notice and a link to their website.
With this license
USER CAN:
Use the icons at native size (scale 1x) in bitmap format.
Use the icons for any purpose, even commercially.
USER MUST:
Give credits to Axialis "Icons courtesy of Axialis Software" with a link to "https://www.axialis.com".
Keep the derivatives. If you remix, transform, or build upon the icons, you may not distribute the modified icons.
Full text of the license: https://www.axialis.com/icons/license.html#free
------ dir.png - this is slightly modified by me (more intense yellow) original icon from the "default_16x16" directory.
The rest of the icons was generated by IconGenerator.
-Select one of the icon sets available on the list and press Enter.
better write-
-In Plugins menu, call Config Toolbar/ Choose icons of code tree, select one of the icon sets available on the list and press Enter.
I renamed file from codetree.Axialis_Flat_Pro_2017_Code_Tree_Icons.zip to codetreeicons.Axialis_Flat_Pro_2017.zip
Readme.md (in ZIP) and information on my site updated too.
Information about installing the remaining icon sets on my site updated, but the Readme.md files I will be able to be updated only tomorrow. I am already 36 hours in front of the computer and I have had enough!
If something else was wrong, let me know in the forum. I will try to fix tomorrow.
Regards..