I'm wondering if it is possible to use SourceTree without Pageant. Currently I'm able to use command line git to push to Bitbucket with SSH keys without using Pageant. This relies on the %HOME% environment variable being set to C:\Users\Michael (or %HOMEDRIVE%%HOMEPATH% or %USERPROFILE%). It may also rely on PLINK_PROTOCOL=ssh however I'm not sure that's required. I simply have id_rsa and id_rsa.pub in C:\Users\Michael\.ssh and it just works. It may also be relevant that both "git" and "ssh" are available on my %PATH%.