It is recommended to use the latest versions of the firmware.
The same version number should be used on the Controller and on the receiver.
Please ignore the "v.1" type versioning label. It is automatically added by my content managment software and is not correct.
The correct version number is in the filename.
rc_2.2.zip is the latest version of everything.
The zip file contains AVR GCC code for the Transmitter and Receiver as well as PCB file made using CadSoft Eagle's Light edition. (ie, the free one.)