The "unarc.dll returned an error code: -1" error can occur due to various reasons, including:
Unlike a generic Windows crash, Error -1 tells you that the installer read a chunk of compressed data, ran a checksum (or CRC check), and found that the data didn’t match what it was supposed to be. The installer stops immediately to prevent installing broken files. unarc dll returned an error code: -1 reddit
Based on user reports and discussions on Reddit, the possible causes of this error include: The "unarc