best way to change fonts to specific elements is to use a font plugin because they offer a lot more flexibility. Was there something specific in the theme that you wanted to change the font to?
Regarding the logo upload… I’m wondering if it’s being affected due to you being on WAMP. I think that was the issue with the other person last year because it seems familiar as I believe that was the culprit. I use XAMPP and just moments ago installed the Lite version as well a new install of Celestial Reloaded…both were able to upload a logo.