HTML error 206 means "Partial Content" That translates to "something interrupted the download". There are a few possibilities here. Most likely is a system security software or firewall that's interrupting the download. The anti-virus is so eager to scan the file that it tries to scan it before it finishes downloading. Second something limiting the size of downloads. Some VPN software does this. Third the hard drive is actually full. There's over 25 BG of included content. Make sure there's plenty of room on the drive where you chose to install your content.

There may be partial downloaded files in your downloads folder. It's best to clean those out before trying again. That will be Downloads\Poser Downloads\Included. (Paste this into File Explorer: %userprofile%\Downloads\Poser Downloads\Included\ )

Make sure there are no partial downloads left in there. They're safe to delete. Then make sure your security software is not being over excited. Then try download loading again.

If all else fails the zip files are available for manual download here: https://www.posersoftware.com/downloads/content/13 You can download the zips and then use Poser's built in zip extracting command. On the top menu click File > Install From ZIP.... Then choose one of the downloaded zip files and which runtime you want the content to go in.