I was trying to run: BiocManager::install("singscore"). But I see the error message below. Please help, thank you!

> BiocManager::install("singscore")
'getOption("repos")' replaces Bioconductor standard repositories, see '?repositories' for
details

replacement repositories:
    CRAN: https://ftp.osuosl.org/pub/cran

Bioconductor version 3.13 (BiocManager 1.30.16), R 4.1.0 (2021-05-18)
Installation paths not writeable, unable to update packages
  path: C:/Program Files/R/R-4.1.0/library
  packages:
    Matrix, mgcv
Warning message:
package(s) not installed when version(s) same as current; use `force = TRUE` to re-install:
  'singscore' 

It's saying you already have that package, and the current version. Unless there is a problem with the package you can just use it. If there is a problem, you can add force = TRUE to make install re-install it.