Any version since version 13 you can get from the SVN (that is when the SVN was started in the mid of 2011).
Kind of amazing that there have been over 3700 revisions in that time. That are more than 250 per month on average or around 8 per day.
If the average time effort for a revision has been 1 hour, then 3700 man hours or 2 man years of work have been invested.
If a man year of skilled work for a company is counted at 50.000, then that means the progress of C2C since mid of last year cost around 100.000. Of course we do it for fun and not for pay but it is still an impressive number (the guesses might be considerably off though).