how to download package from https://launchpad.net/ubuntu? example inside

I'm beginner for Unix. I can use "sudo apt-get install...." to install the package, but it is not the version I need(too new), that why I need to find and download an older version from other place.

I want to download the package from https://launchpad.net/ubuntu/+source/bowtie2/2.2.4-2.
There are 3 files at the bottom, which one should I download, how to install in ubuntu?

Thanks,

There is a .deb package of that version here

You can click the .deb file to download it or do this:

wget http://launchpadlibrarian.net/190682664/bowtie2_2.2.4-2_amd64.deb

And then make sure you have the dependencies:

sudo apt-get install libc6 libgcc1 libstdc++6

(probably all newest version already)

Then install:

sudo dpkg -i bowtie*

but this old version may not work well on your system and won't be updated...