Look for paradise_lust_win64_0.20.0a.part1.rar .
It looks like you’re trying to handle a specific multi-part archive for the game (version 0.20.0a). Because this is a .part2.rar file, it cannot be opened on its own; it is part of a split archive that requires all pieces to function. paradise_lust_win64_0.20.0a.part2.rar
If the archive asks for a password, check the site where you downloaded it; common passwords for game archives are often the name of the site or the uploader. Look for paradise_lust_win64_0