I solved, at last, the Diablo 4 installation problem.
In case it can be of any use, I will now briefly describe how I did it.
Having installed Lutris, previously, go, in configuration, where it says Wine. Once there, click on the arrow that appears. A menu of options will open, select lutris-GE-Proton8-10. Click on install.
Click on the cogwheel next to the arrow. The Wine configuration menu will open. In the Wine version option click and select the one mentioned above. Finally click on save.
Finally, in the general option, install Battle.net and follow the corresponding instructions. Once Battle.net is installed, open this menu. Once there, find the Diablo 4 game and install it.
Finally, let's play and enjoy it!
This looks to me like a tutorial, therefore I've moved it to #tutorials-guides.
I've also changed the title.