“Adobe ColdFusion 10” can’t be opened. You should eject the disk image.

Hello,

Dowloaded Coldfusion from the Adobe website, both with Safari as with Firefox

I want to install Coldfusion 10 on my Macbook. OS X 10.7.4 ( so not 10.8 ). When I double click the
.dmg file , I always get "“Adobe ColdFusion 10” can’t be opened. You should eject the disk image." error. Never had this before. I've read about setting security on 'non signed packages', but this applies to 10.8.

Is this a known issue ?

Thanks,

Dirk

dirk@dinnewet.be