To successfully locate part03.rar , you should look where you found the first two parts:
If "Useful Paper" refers to a specific website or blog, use their internal search bar for "Patch" or "Downloads." Download Patch part03 rar
Remember that to extract the contents, you must have (part01, part02, part03, etc.) in the same folder before opening the first one with a tool like WinRAR or 7-Zip . To successfully locate part03
Do you have a or the specific name of the software this patch is for? I can help you look for alternative mirrors if I have more context. To successfully locate part03.rar