Hi! First timer here. I have a simple question. How big is the Ubuntu release of Kdenlive in MB? My dad is REALLY stringent about how big programs are when downloaded, so he wants to know. Thanks!

It is very small.

synapatic reports 0.9.10-0ubuntu0~sunab~trusty1 is 1251 kB to download and 4360 kB when installed.

You need a few other packages too. - eg frei0r-plugins 5245 kB installed.

But all this pales into insignificance when you consider it relative to the size of any video file you are likely to edit.
So your Dad should lighten up.