In a multi-part set, all files except the very last one should be exactly the same size down to the byte. If your part06.rar is significantly smaller than parts 01 through 05, the download was likely interrupted and is corrupted.
Specifies that this file is the sixth volume in a sequential multi-part archive chain. LAFBD-41-4K.part06.rar
Ensure you have downloaded LAFBD-41-4K.part01.rar through the final part. In a multi-part set, all files except the