I just tried this install on a fresh machine and had no problems. However, it is possible that if you installed a newer version and then tried going back, something may have gone wrong. Here is a potential solution to try:
(1.) Delete the module repository (Usually C:\Users\Username\AppData\Local\SyncroSim\1\Modules). Then run the GUI – this will re-create the module repository
(2,) If it still does not work, it might be worth making sure that SyncroSim.StochasticTime.dll is in C:\Program Files\SyncroSim\1 along with “stime.module.config”
Let me know if this does not resolve your problem.