You are asking someone to execute a shell script directly from the internet, which is questionable in the first place. And then you're making it much much worse by asking them to do it with a non-https link, meaning that someone can trivially execute a MITM attack.
Your webpage doesn't have any explanation other than a video. I can read a paragraph or two in a couple of seconds--I'm not going to take a minute and a half (and stop listening to the music I'm listening to) to watch a video. The GitHub README doesn't really have any information about what it is either.
I haven't actually tried this, because I have no idea what it is. The other comment in here linked to an example .freshrc file--I noted that every line that's not a comment starts with the string 'fresh ', which seems like an obvious annoyance. Even if you want it to just be a shell script you can execute, you could support a batch mode to do something like this, for example: