Since Github does not support file with size larger than 100MB, source code of this package is hosted at gitlab.
You may install from gitlab with
devtools::install_git('https://gitlab.com/Marlin-Na/BSgenome.PAbelii.UCSC.ponAbe2.git')
or from github with
devtools::install_url("https://github.com/H3K4me3/BSgenome.PAbelii.UCSC.ponAbe2/releases/download/virtual-0.0.1/BSgenome.PAbelii.UCSC.ponAbe2_0.0.1.tar.gz")