Open only the first file ( .7z.001 ) using a program like 7-Zip or WinRAR.
Transfer the resulting .cia file to your 3DS SD card and install it using a title manager like FBI. ⚠️ Common Issues SMTIVA-USA-(UNDUB)-CIA-Ziperto.7z.002
If you are missing .001 , you cannot extract the data. Open only the first file (