You cannot "open" part 4 individually. You must initiate the extraction from Part 1 .
If a 60GB download fails at 90%, you lose everything. If a 2GB part fails, you only need to re-download that specific segment. ER_2GB.part04.rar
If Part 04 specifically shows a "Checksum Error," it means that specific file was corrupted during download and needs to be re-downloaded. Why Is It Split into 2GB Segments? You cannot "open" part 4 individually
Always start with the first file. Right-click ER_2GB.part01.rar and select "Extract Here" . ER_2GB.part04.rar
Software like WinRAR or 7-Zip is required to join these segments back into a single usable folder or ISO. How to Extract "ER_2GB.part04.rar"
Many file-hosting services have a 2GB file size limit for free users.