install and delete specific fonts and fix a few issues

Description

There are few things in my Windows 11 that need to fix. (1) I'm using Windows 11, but suddenly deleted the system protected fonts NSimSun and SimSun by mistake. The version should be 5.18. Because I deleted the system protected fonts, I found and installed the lower version instead. I want someone that can help me installing the 5.18 version and delete the older version. (2) I installed fonts CNS11643, but I can't see the font family in control panel, please help to fix.(3) I installed MS Office 2021 professional plus version using volume licence, after I installed, when I checked on my account, it shows that some of the applications like Word and Excel are 2016. But for others like Project and Visio are 2021. Please help to fix.(4) Please help to remove the watermark circled in red without removing the wallpapaer. (see the attachment)