1)Now I use Lightrom 5.7 how to upgrade to 6 or CC?
Purchase the standalone upgrade from here: Products
Download CC version from here: Explore Adobe desktop apps | Adobe Creative Cloud
2) What is the difference between 6 and CC version?
See this comparison chart: Compare Lightroom versions | Adobe Photoshop Lightroom CC
3) When I used lightromm 3, I could see in EXIF the distance in meters till the object I took, in the later virsions that function disappeared, it is very sad I am stiil waiting and hope that it would be possibble in the new versions. Or this indication may possible by setting?
Rob Cole's ExifMeta plugin displays the Subject Distance field (and much more). Unfortunately, his Web site appears to be down again. He used to be very active here, but he hasn't posted in several months.
Thank you I am pleased with your reply ! But I hope that the Adobe crew will return that EXIF data in future versions.