Extracted without any errors with it.
Yes, you are right. Everything works. Something was wrong with the Winrar.
So, if some issues with unpacking appear, I'll recommend to use the 7Zip (in my case it worked).
Also the first new game and .jar loading are quite long, so it is strictly recommended to wait a bit.
If you try to build buy yourself, remember that following instructions will lead to
22mb .jar file, which works like an usual .exe in big games.
Also a version of the building software is critical. To solve problems is strictly recommended to follow the instructions in the
pinned messages in #techsupport on Innoxia's Discord server
Sorry, if I told you some obvious stuff, but by this post I'm making an attempt to prevent time loose on stupid mistakes