Right-click part1.rar and select "Extract Here" (using software like WinRAR, 7-Zip, or The Unarchiver). The software will automatically combine both parts to extract the content.
sc24857-FS22v1820.part1.rar (You likely need this one too)
If you provide the website, I can give you the specific .
Ensure you have part1.rar and part2.rar in the same folder.