Currently the most widely used version of InputMapper considered feature complete, however is being phased out in favor of InputMapper 1.7 which is more modern and stable and has less issues with Windows 10 and exclusive mode.
Forewarning, If you are not willing to deal with incomplete, buggy, and in some areas completely non working software; then nightly builds are not for you.
For those that want to tinker with new features as I make them though I have implemented an automated system that will upload nightly builds on a regular basis. These builds will not have an installer and may require manually installing drivers using WDK's, so some PC knowledge is recommended. There is also no official support for this as most of the things that are broken I either already know about or are due to a user mis-configuration which without an installer I dont have the time to troubleshoot a hundred different issues. There is also no (current) system for notifying users when new nightly builds are available, You will have to periodically check back and compare version numbers or dates manually.