install.sh fails to install on correct paths about nim HOT 1 OPEN

[...]
  case $1 in
    "--help"|"-h"|"help"|"h")
      echo "Nim installation script"
      echo "Usage: [sudo] [env DESTDIR=...] sh install.sh DIR"
      echo "Where DIR may be:"
      echo "  /usr/bin"
      echo "  /usr/local/bin"
      echo "  /opt"
      echo "  <some other dir> (treated similar to '/opt')"
      echo "To deinstall, use the command:"
      echo "sh deinstall.sh DIR"
      exit 1
      ;;
    "/usr/bin")
      bindir=$1
      configdir="/etc/nim"
      libdir="/usr/lib/nim"
      docdir="/usr/share/nim/doc"
      datadir="/usr/share/nim/data"
      nimbleDir="/opt/nimble/pkgs/nim-2.1.1"
      ;;
    "/usr/local/bin")
      bindir=$1
      configdir="/etc/nim"
      libdir="/usr/local/lib/nim"
      docdir="/usr/local/share/nim/doc"
      datadir="/usr/local/share/nim/data"
      nimbleDir="/opt/nimble/pkgs/nim-2.1.1"
      ;;
    "/opt")
      bindir="/opt/nim/bin"
      configdir="/opt/nim/config"
      libdir="/opt/nim/lib"
      docdir="/opt/nim/doc"
      datadir="/opt/nim/data"
      nimbleDir="/opt/nimble/pkgs/nim-2.1.1"
      ;;
    *)
      bindir="$1/nim/bin"
      configdir="$1/nim/config"
      libdir="$1/nim/lib"
      docdir="$1/nim/doc"
      datadir="$1/nim/data"
      nimbleDir="$1/nim"
      ;;
  esac
[...]