Can I reinstall 2020 version of lightroom classic

Hi, i have an older Mac and I don't have space to update the software to more than version 10.

the newer light room is not comparable with this so I've been using the 2020 version. My lightroom wasnt working last night so I uninstalled it from creative cloud and now I cannot reinstall it with the version I had before.

i am saving for a new computer but as of right now I need access to my lightroom.

are there any direct links to download to 2020 version or a way of doing this? Thank you