You cannot extract "part10" alone. You must have all preceding parts (part1 through part9) in the same folder.
Copy the extracted firmware file to the of the USB. Insert the USB into the TV's USB 2.0 port. Download RSAG7 820 7918 Hisense HxxA6100 Series part10 rar
on "part1" and select "Extract Here" using WinRAR or 7-Zip. You cannot extract "part10" alone