Download a specific version

Download a specific version

Hi,
For some reason we have in production a 5.6 pre-release version of the Xceed WPF grid and currently we are experiencing a bug when grouping and selecting a row. The problem may be very well already fixed in the next release version ( 5.7? ) however we didn’t download that version when it was available few years back. I DON’T want to upgrade to 6.x at this point, 5.7-5.8 RELEASE would suffice however I cannot seem to be able to download that from anywhere. We DO have a licence for 5.7 I have the key, that’s obviously useless without the code.
Any help would be greatly appreciated!
Thanks!