The included version of Quakespasm (Quakespasm 0.92.2.zip) is required to play these maps. It is the same engine that was included with the release of ad_sepulcher. Otherwise, Quakespasm 0.93.0 when it is officially released will be able to run these maps without issue. No other engines have been tested with these maps, and most likely will not work properly. Use them at your own risk.