Hi i have question, i have blogs with almost 100 posts and i wanna change current theme to another from site library. If i import settings + demo contetnt my old posts will be deleted?
No you’re old posts will not be deleted.
However we don’t recommend installing a Library Site on a pre-built site as things may not work out as expected and may require some ‘repair’ work.
If you do want to try – then create a Staging site, and import the Library Site there. Then if it works ok you can push it live. Or make any repairs before doing so.