If your internet cuts out, you only lose the progress on that specific 1GB or 2GB part, rather than the entire game file. The Risks (The "Watch Out" List):
Since ".rar" files—especially those split into parts—are common formats for large software downloads, Prototype 2.part2.rar
Files named exactly like this are often found on third-party "abandonware" or repack sites. Because they are executable archives, they are a common delivery method for malware or unwanted "adware" installers. If your internet cuts out, you only lose