It is recommended that study organisers add an renv lockfile into the study to ensure the study can be run in the future. If the lockfile is in the study, it is recommended to install the package using renv (see study install using renv guide). If the renv lockfile is not available, to install the package with devtools (without using renv) run:
# get the latest PatientLevelPrediction
install.packages("devtools")
devtools::install_github("OHDSI/FeatureExtraction")
devtools::install_github("OHDSI/PatientLevelPrediction")
# install the network package
devtools::install_github("ohdsi-studies/SkeletonPredictionStudy")
If the above runs sucessfully, you can now proceed to execute the study.