Transmit 3.5.1 was released on the 3 days ago by their creators Panic. If you legally own Transmit 3 you can get a free upgrade, otherwise it’s $29. If you don’t legally own it and think you can download it and find a serial in Serial Box you are wrong. The latest version of Serial Box only covers up to version 3.2.1 of Transmit. But if you do happen to download 3.5.1 and over write your current version just download the older version again. Transmit does not keep older versions of Transmit on their site so you will have to find it somewhere else….like here. 
thanks for this tip
as ive a non kosha copy and the update meant that tmy seriel (dodgy too) wasnt valid!
Your welcome, and thank you for visiting my site! I’m always glad to help.
thanks man! I just had this problem myself while reinstalling Transmit on my new iMac DualCore. Much appreciated for the old version download!
Awesome! Glad to help!