The package contains example data for RNAmodR package and other related packages. It probably makes sense to have a look at RNAmodR to check out how the data can be used.
The current version of the RNAmodR.Data package is available from Bioconductor.
if (!requireNamespace("BiocManager", quietly = TRUE))
install.packages("BiocManager")
BiocManager::install("RNAmodR.Data")
library(RNAmodR.Data)