Is there any support for XP/2k3 anymore?
It is currently broken, but I intend to fix it - see https://github.com/ncw/rclone/issues/1481 for a binary which will work. The 1.36 release should work fine.
I’m currently using the 1.36 version that fixed windows SFTP support. Will this conflict with that?
No, it has those fixes in too.