tmsens is on CRAN, you can install it in R with
install.packages("tmsens")
Or you can install the development version from GitHub with
# install.packages("remotes") # uncomment if remotes not installed
# remotes::install_github("dea-hazewinkel/tmsens")
install.packages("tmsens", repos = c('https://dea-hazewinkel.r-universe.dev', 'https://cloud.r-project.org'))