The download assistant does more than assist with online downloads, i used it first to upgrade from 7 to 10 without losing over 12 years of FSX files. As fas as getting the Win 10 downloads v2004 its usually easier and faster go directly to MS.
There quite a few wsys to go the restores and not lose anything contrary to whats being said, you can get your key and admin by going in as Admin and resetting or doing a change on User. I know as admin it has alot of ups and downs so i make sure i open
all hidden files. To get in and change your password go in safe mode, depending on typre of computer the keys will be different , cntrl shft f9, but tge usuals are F7,8,9,10,11,and12, there be others but usually F 9or,10. In safe mode you can find out what
your password was .