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In general, if anyone is interested, there are two nuances here!
1) It is up to the judge to decide whether the donation to the mod is a material benefit or not.
2) Strictly legally, the modder's offer to support him with money is not prohibited by law; the services are paid for not for the content, but for the work done, BUT if the copyright holder says: "I am offended!", then the one who asked to make a donation for the development of the project will be to blame.
In short, it is possible as long as no one sees it and/or if the user himself does not write to the author in a private message - saying, "Give me the details, I want to thank you for your work." In this case, there will be no violations and nothing to complain about.
Added fix from (09.05.2018):
— Fixed the armies of the duel heroes of the Dwarves and Necromancer;
— On the map "Battle for Glory", the starting garrisons in the cities have been fixed;
— Fixed an error in the display of the name "Blood-Eyed Cyclops";
— "Higher Liches": mana reserve 21;
— "Sultans of Djinns": fixed an error with the skill;
— "Angels": attack 24 (-3), defense 24 (-3), initiative 10 (-1);
— "Archangels": attack 28 (-3), defense 28 (-3), initiative 10 (-1);
— Repair skill - coefficient 2.5 (-2.5) health per creature.
— The "War Machines" ability gives +200 (-100) health to machines for each level.
The patch is cumulative; it contains changes from all previous mini-fixes.
Installation: It is installed only on version "04.05.2018-Beta".
Move the file "Remake-Fix (09.05.2018).pak" to the RMod directory.
Have a nice game.