apt - Can I install software even though the repository hasn't been updated for my Ubuntu release version?

I'm trying to install the Fuze Meeting client which I'm planning to use for Webinars at work. They have a Linux client and make it available through an apt Repository.

Their installation instructions are:

sudo bash -c 'echo "deb http://apt.fuzebox.com/apt $(lsb_release -sc) main" > /etc/apt/sources.list.d/fuzebox.list'
sudo wget -O /etc/apt/trusted.gpg.d/fuzebox.gpg http://apt.fuzebox.com/apt/keyring.gpg
sudo apt-get update
sudo apt-get install fuzelinuxclient

However I'm on Utopic 14.10 and their repository is only current through Trusty. Is there a way to install this software on Utopic even though it is only officially available for older versions of Ubuntu?

I tried replacing $(lsb_release -sc) with trusty in the above steps but I get the following warning when I try to apt-get update.

W: Failed to fetch http://apt.fuzebox.com/apt/dists/trusty/Release Unable to find expected entry 'main/binary-amd64/Packages' in Release file (Wrong sources.list entry or malformed file)

And then this error when I try to install:

E: Unable to locate package fuzelinuxclient

You can try. Replace the $(lsb_release -sc) command in their instructions with trusty. Follow the rest of the steps.

However, note that because library versions change from version to version, the Trusty version might not be installable on Utopic, or might not work correctly.