[SOLVED] “JDownloader Installer” can’t be opened because it is from an unidentified developer.

I had JDownloader installed and running perfecty fine on Mountain Lion

I have since "upgraded" to Maverick, but can't seem to get JDownloader to even install!

I tried different versions of the software, and only one seems to attempt to install it, but I get the error message:

JDownloader Installer” can’t be opened because it is from an unidentified developer.

The other versions ALL say they are corrupted, and asks me to unmount the image.

This is seriously debilitating for me!

Any help in resolving this issue would greatly be appreciated,

Thanking you in advance.

~isa