Hello dwigfor,
I just downloaded Content Example 4.5 from the Marketplace and created a new project with in the 4.5 version of the engine. I went into open level and was able to locate the BP_Input_Examples Map from the options. Try taking the current version of your “Content Examples” project and deleting it from your launcher. Then go to the Marketplace and re-download the examples being sure the current version is selected (version 4.5). Hopefully this fixes your issue, but if you are still experiencing the error let me know and I will assist you further!
Thank you,