Cannot install package "LTRCtrees" for management left-truncated, right censored and interval-censored survival data.

One of the dependencies, the Icens package, has been removed from CRAN, but you can install it from Bioconductor and then try to install LTRCtrees

if (!requireNamespace("BiocManager", quietly = TRUE))
    install.packages("BiocManager")

BiocManager::install("Icens")

Note: Please do not post screenshots, they are considered a bad practice here, post formatted code instead, here you can find how to do it.