You will need WineHQ, register and login access to Gods Unchained game and Steam installed.
Also download EXE file launcher ( I did it with Windows ).
Register: https://godsunchained.com/account/register?referral=aZDyZKChOj
Then:
1 Make installation file executable ( launch as program )
2 In steam: Install Proton Experimental ( Bleeding Edge version )
3 Add game as NON-STEAM and enable Proton
4 Launch game and play