I don't have a good solution but wonder if you could narrow down the
problem by getting them to send you sessionInfo() (or
devtools::session_info()) from a clean R session with just devtools

  system.file() might be an alternative to paste0 + find.package()
(won't help much with the fundamental problem)

On Mon, Apr 16, 2018 at 9:40 AM, Alexandre Courtiol
<alexandre.court...@gmail.com> wrote:
> Dear all,
> I am teaching a class and for that I created a R package that mostly
> contains vignettes (the slides of the course).
> I host the package on GitHub because I want the students to download every
> day the latest version of the package.
> Building the vignettes takes a couple of hours so I pre-build the vignettes
> using devtools::build_vignettes before pushing my updates to GitHub.
> The student install the package using
> devtools::install_github("courtiol/LM2GLMM").
> Then, they do library(LM2GLMM) and browseVignettes(package = "LM2GLMM")...
> ... and that works on 2/3 of the computers, for the others it says
> vignettes not found.
> Any idea why and what can I do to make it 100% success?
> Of course on my laptop it works, so I cannot investigate.
> Also, since they all use different versions of R, devtools or OS... I would
> like to know the one thing that must be changed if it comes from that (but
> I am not sure it does).
> I have added a back up function that works for the 1/3 of unfortunate
> students:
> get_vignettes <- function() {
>   utils::browseURL(paste0(find.package("LM2GLMM"), "/doc/")) ## for
> installed
>   utils::browseURL(paste0(find.package("LM2GLMM"), "/inst/doc/")) ## for
> development
>   return(invisible(NULL))
> }
> This functions opens de vignette folder and that shows that all the
> students actually have the html files installed correctly. But it is ugly
> because then they have to find the good html file and so forth, so I would
> rather have a better solution.
> Many thanks,
> Alex
> --
> Alexandre Courtiol
> http://sites.google.com/site/alexandrecourtiol/home
> *"Science is the belief in the ignorance of experts"*, R. Feynman
>         [[alternative HTML version deleted]]
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