As now Uber is compatible with Joomla 3.7, I would like to update it. What is the beast was to do it then ?
Hello
You can use the Ja_extension manager component to update template to latest version released.
Also would it be better to update to the new version of the template and then update to Joomla 3.7 or should I update to Joomla 3.7 and then update the template ?
Through the ja_extension manager component you should first update all extensions to latest version released, then update also all other 3rd part extensions and then update to Joomla 3.7.1
And my last question : I have set up different style from this template (one for the home page, on for the rest of the website) will this be erased by the new installation ?
If you used custom.css file to make your customizations then it will be not updated if you indeed made your changes in default css files then they will be overwritten.
P..S.
First to make any update take a full website backup so you can restore working version if something goes wrong.
Regards