// KSP 1.9.1.2788
// Kerbal Alarm Clock 1.8.9
print version. // 1.2.1.0

print ADDONS:KAC:AVAILABLE. // True
GLOBAL na IS ADDALARM("Raw",time:seconds+600,"kOS TimeWarp", "Script activated warp throttle.").
PRINT na:ACTION. // "PauseGame" (actual action is KillWrapOnly)
SET na:ACTION TO "KillWarpOnly".
PRINT na:ACTION. // "KillWrapOnly" (actual action is KillWrapOnly)
SET na:ACTION TO "Pause Game".
PRINT na:ACTION. // "KillWrapOnly" (actual action is KillWrapOnly)
SET na:ACTION TO "PauseGame".
PRINT na:ACTION. // "PauseGame" (actual action is KillWrapOnly)

Note. I guess not supported this version.