Generally speaking, we recommending running the version posted on that page. We don't go backwards on preview versions (and if we do we roll back one or two versions at most). This looks like it's just a glitch on our website, which has now been corrected. You can download the newest preview, 1.1.375, here:
https://www.rstudio.com/products/rstudio/download/preview/
Appreciate the report!