My dad has the original software and i can't install the program because my dad is in the US and I'm in the Philippines. Now, I asked the serial number of his adobe lightroom. How can I download the software using the serial number? thanks.
If you just need a copy of the software, then download the trial copy of Lr available from Adobe. On entering your serial number it will then become a full copy.
You should not use your fathers serial number if he is also using it as Lightroom is a single user license.