How to I go about upgrading it and importing my old wallet?
Which OS are you using? Just install the latest version.
- If you are on Windows, just download the latest file on the website[1] and run it.
- If you are on Linux, run the commands mentioned in the website:
sudo apt-get install python3-setuptools python3-pyqt5 python3-pip
sudo pip3 install https://download.electrum.org/3.2.2/Electrum-3.2.2.tar.gz
P.S: You should always have your seed backed up (even before upgrading Electrum). So if you don't, just do it right now.
[1]
https://electrum.org/#download