Can't install TinyTeX on Windows Server - r

Question

This is similar to this issue, but the solutions mentioned didn't work for me. I tried to install TinyTeX via different methods:
tinytex::install_tinytex()
download TinyTeX-0.zip, and use tinytex:::install_prebuilt() on it
manually extract TinyTeX-0.zip (unzip() works) and run install-tl-windows (Batch file)
In the first two cases, I have this error:
Error in system2("tlmgr", args, ...) : '"tlmgr"' not found
In addition: Warning message:
In extract(pkg, exdir = path.expand(target)) :
error 1 in extracting from zip file
In the third case, the Windows console looks like this:
'\\crc\users\etienne\Desktop\TinyTeX-0\TinyTeX'
CMD.EXE was started with the above path as the current directory.
UNC paths are not supported. Defaulting to Windows directory.
and then closes without doing anything.
In every case, tinytex::is_tinytex() returns FALSE and tinytex::tlmgr_path() returns nothing.
I am working on Windows Server 2019 Standard (1809). What should I do?
> sessionInfo()
R version 4.1.0 (2021-05-18)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows Server x64 (build 17763)
Matrix products: default
locale:
[1] LC_COLLATE=French_France.1252 LC_CTYPE=French_France.1252
[3] LC_MONETARY=French_France.1252 LC_NUMERIC=C
[5] LC_TIME=French_France.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] compiler_4.1.0 tools_4.1.0 tinytex_0.33.1 xfun_0.25

Answer 1

Solved in this GitHub issue
In summary:
run tinytex::install_tinytex(dir = "<path>") where <path> is a local folder on the server, e.g in my case "C:/Users/etienne/TinyTeX"
put options(tinytex.tlmgr.path = tinytex:::find_tlmgr("<path>")) in your .Rprofile (you can easily do that with usethis::edit_r_profile("user"))
restart R
check that tinytex::is_tinytex() is TRUE (you can also try to install a package with tinytex::tlmgr_install("booktabs") for instance)