: The standard tool, effective for handling multi-part archives. 7-Zip : A free, open-source alternative. 3. Extract the Files (Reconstruct) Do not try to extract every part individually.

The software will automatically detect all subsequent parts and combine them into one file.

If you get a "CRC failed" error, it means one of the parts did not download completely. Re-download the specific part causing the error.

Here is how to download and reconstruct (make a piece) these types of files:

You will need a file extraction tool that supports RAR, such as:

only the first part of the archive (e.g., 990OPSR1x64.part1.rar or 990OPSR1x64.001 ).