I wanna install "org.Mm.eg.db" to my macbookpro, and error accurred. I tried using different network connections, but it didn't matter. Thanks!

BiocManager::install("org.Mm.eg.db")

# Bioconductor version 3.12 (BiocManager 1.30.10), R 4.0.4 (2021-02-15)
# Installing package(s) 'org.Mm.eg.db'
# installing the source package ‘org.Mm.eg.db’

# 试开URL’https://bioconductor.org/packages/3.12/data/annotation/src/contrib/org.Mm.eg.db_3.12.0.tar.gz'
# Content type 'application/x-gzip' length 73584784 bytes (70.2 MB)
# ===========
# downloaded 16.5 MB

# Error in download.file(url, destfile, method, mode = "wb", ...) : 
#  download from 'https://bioconductor.org/packages/3.12/data/annotation/src/contrib/org.Mm.eg.db_3.12.0.tar.gz' failed
# 此外: Warning messages:
# 1: In download.file(url, destfile, method, mode = "wb", ...) :
#  downloaded length 17310872 != reported length 73584784
# 2: In download.file(url, destfile, method, mode = "wb", ...) :
#  URL 'https://bioconductor.org/packages/3.12/data/annotation/src/contrib/org.Mm.eg.db_3.12.0.tar.gz': Timeout of 60 
# seconds was reached
# Warning in download.packages(pkgs, destdir = tmpd, available = available,  :
# download of package ‘org.Mm.eg.db’ failed
# Old packages: 'utf8'
# Update all/some/none? [a/s/n]: 
# n

sessionInfo( )
# R version 4.0.4 (2021-02-15)
# Platform: x86_64-apple-darwin17.0 (64-bit)
# Running under: macOS Big Sur 10.16

Solved. I first download source package (org.Mm.eg.db_3.12.0.tar.gz ) from bioconductor manually and then install the package using Rstudio "install from Package Archive File" option.