Hello, I am taking an old course, and for that, I downloaded the R version 3.6.3 because I was having problems with the packages in the latest version. Now, in this version, I am still unable to install Rsamtools correctly, and I get the following error. Additionally, I downloaded Rtools34.exe and later Rtools35.exe, which are supposedly compatible with R 3.6.3, but still nothing works.

# BiocManager::install("Rsamtools")
# 'getOption("repos")' replaces Bioconductor standard repositories, see 'help("repositories", package =
"BiocManager")' for details.
Replacement repositories:
    CRAN: https://cran.rstudio.com/
Bioconductor version 3.10 (BiocManager 1.30.25), R 3.6.3 (2020-02-29)
Installation paths not writeable, unable to update packages
  path: C:/Program Files/R/R-3.6.3/library
  packages:
    boot, class, cluster, codetools, KernSmooth, mgcv, nlme, nnet, rpart, spatial, survival
Warning message:
package(s) not installed when version(s) same as or greater than current; use `force = TRUE` to
  re-install: 'Rsamtools'

It's already installed. Note the warning:

Warning message:
package(s) not installed when version(s) same as or greater than current; use `force = TRUE` to
  re-install: 'Rsamtools'