How can I use the unstable version?

[ifox]

Hi there!

This may be a naive question, but I am new to the nix ecosystem.

I love the philosophy behind Fleek and I'd really like to use it as my primary tool to configure my Mac.

I got the high bling set up and working great, however I can't search or add new packages due to an error. I noticed the issue was fixed in the main branch but there are no new releases yet. How can I test Fleek with that fix? Alternatively, could I downgrade Nix to get Fleek 0.10.5 working?