Original Czech version available on YouTube!
https://www.youtube.com/watch?v=ph9n5F7SipY
sharedvd with english subs is also available from ebay
http://www.ebay.com/itm/Ikarie-XB1-Icarus-XB-1-DVD-1963-Czech-Sci-Fi-Film-English-subtitles-/131424660372?hash=item1e99852b94
as well from czechmovie.com
http://czechmovie.com/d/ikarie-xb1-icarus-xb-1-dvd-1000314/