Website is moved to staging domain and now we can't update the theme on the staging domain
Because of many open updates we decided to create a staging development site to update everything there and afterwards point the domain to the new enviroment. The first thing is done, but now we can't update the theme and I think it's because the theme is activated on the main domain. There is a button called "deregister domain" but I don't like to press that button because It looks like the live website will stop working.
Hope you guys can help me out,