Using trial to create stuff for the game

Hello, I have the following question if I can legally create a weapon skin in Counter-Strike: Global Offensive with a trial version of the substance paint.

To share knowledge with the uninitiated:

When creating a CS: GO skin, you can vote to add it to the game, if there are enough votes to add the skin to the game, you will receive a share of the skin's sales on Valve platform - Steam