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Right-click part01.rar and select "Extract Here." The software (like WinRAR or 7-Zip) will automatically pull data from the other parts, including part06, to create a single .bin or .pkg file.
Hold the button on the TV (not the remote) and plug the power cord back in.
For general Smart TV downloads, the SmartTech TV Download Center lists various 55-inch models, though you must match the exact build version. How to Use Multipart RAR Files
Some technicians provide download links in the descriptions of YouTube tutorials. You can find general IRIS update guides on YouTube which sometimes link to external repositories for files like part06.rar.