Read more about Survo R at Survo web pages: survo.fi
You can install (binaries of) the latest version of Survo R from R-universe with:
install.packages('muste', repos = c('https://rsund.r-universe.dev', 'https://cloud.r-project.org'))
Or directly from the source repository in GitHub with:
# install.packages("remotes")
remotes::install_github("rsund/SurvoR/pkg/muste")