I'm running R v3.4.3 and I see an error when I try to read a publicly available rds file.
>githubURL<-("https://github.com/ChongWu-Biostat/aSPUpath2/blob/master/Example/example.stat.rds")
>download.file(githubURL,"example.stat.rds", method="curl")
>example.stat<-readRDS("example.stat.rds")
Error in readRDS("example.stat.rds") : unknown input format
That URL points to the web page for that file. You've downloaded the HTML and tried to load that as a .RDS. If you look at the .RDS file you'll see.
You really want the URL for the raw data:
> url = "https://raw.githubusercontent.com/ChongWu-Biostat/aSPUpath2/master/Example/example.stat.rds"
> download.file(url,"example.stat.rds", method="curl")
[download progress...]
> example.stat<-readRDS("example.stat.rds")
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