Use your preferred custom firmware installer to install the resulting .nsp to your Switch.
What are you planning to use to install the game (e.g., Tinfoil, DBI, Goldleaf)? Did the extraction produce an .nsp file without errors? Paradigm Paradox (NSP)(eShop).part2.rar
This is a .part2.rar file. It cannot be used alone. You must have Paradigm Paradox (NSP)(eShop).part1.rar (and any other parts) in the same folder to extract the final .nsp file. Use your preferred custom firmware installer to install