I forked this project and continued to develop it by myself.
I want to signal my first public release:
https://github.com/Enoch72/sgminer-MD/releases/tag/MD-1.0.6* Fixed Xevan kernel compilation on older cards (HD 7950)
* Added color to the terminal log.
There also speed improvement but since I have oldest AMD card (7950 , r9 390x) I can't say this is true for newer ones.
Bye,
Giovanni
The source code for the commercial version is available for a price of $200 or the same in cryptocurrency.
You can use the commercial without pay but, warned, the license is not valid and you cannot claim the sources.
You are actually breaching the terms of the original GPL v3 license by not releasing sources, and have the guts to demand money for it

Have you read carefully the license ?
4. Conveying Verbatim Copies.
You may convey verbatim copies of the Program's source code as you
receive it, in any medium, provided that you conspicuously and
appropriately publish on each copy an appropriate copyright notice;
keep intact all notices stating that this License and any
non-permissive terms added in accord with section 7 apply to the code;
keep intact all notices of the absence of any warranty; and give all
recipients a copy of this License along with the Program.
You may charge any price or no price for each copy that you convey,
and you may offer support or warranty protection for a fee.