Some downloaded packages fail to unzip although MD5 checksums match #195

@mcordts Hi, thank you for maintaining this repository and the Cityscapes dataset.

I encountered an issue when downloading several packages from the official Cityscapes download page. Although the downloaded files pass the MD5 checksum verification provided on the website, the extraction process of some of them reports errors and stops before completion

To help with debugging, I am attaching a JSON list containing the filenames of the packages that failed to extract
cityscapes.json.

Could you please advise whether this might be a known issue (e.g., related to the archive format, mirror servers, or extraction tools), or if there is a recommended way to resolve it?

Thank you very much for your help!