Cannot install 4.1.1

[Soyeso]

I downloaded the following:

Apache_OpenOffice_4.1.1_MacOS_x86-64_install_en-US

for a Mac running 10.7.5.

When I try to open it, I get a little dialog box saying that it cannot be
opened.
Does that mean it is corrupted, or not suitable for my system?

Thanks,
Tom