I had been getting compilation failed errors when running install.packages('shiny') and I was just about to install rtool40 (which is what was suggested on various forms for that error) but then I updated RStudio and tried running the same exact command again and shiny installed just fine. Any reason this could be?
Your RStudio version has nothing to do with your package library so it shouldn't be related but it is likely that resetting your R session (while updating RStudio) has solved your installation issue.
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