I'm getting the same. I keep trying to reinstall 188.8.131.526. It works great, but tells me that the application has been updated and needs to restart. When I restart it, after about 15 seconds, I get the "stopped working" error. Event viewer logs say:
Faulting application WowAceUpdater.exe, version 184.108.40.2066, time stamp 0x483f1b8b, faulting module KERNEL32.dll, version 6.0.6001.18000, time stamp 0x4791a76d, exception code 0xe0434f4d, fault offset 0x000442eb, process id 0x16b4, application start time 0x01c8e9ab68ea42a5.