diff --git a/README.md b/README.md
index 1789d54..36f0bcb 100644
--- a/README.md
+++ b/README.md
@@ -55,18 +55,17 @@ Your new `hugo` binary is in `./bin`, so change your Makefie or scripts to use `
 
 ## Status
 
-* Only GitHub Releases are supported right now
-* Binares are installed using `tar.gz` (`zip` support is coming)
+* Only GitHub Releases are supported right now.
+* Binares are installed using `tar.gz` or `zip`. 
 * No support for Windows anything.  I just don't know enough about it.
 * No OS-specific installs such as homebrew, deb, rpm.  Everything is installed locally via .tar.gz.  Typically OS installs are done differently anyways.
 
 ## TODO
 
 * #3 Zip support 
-* #4 and format over-rides.
 * #5 Checksum support
 * #8 Setup travis.ci
-* #10 Adjustment of default `TMPDIR` and `BINDIR` (install directory)
+* #10 Adjustment of default `BINDIR` (install directory)
 * #11 Use goreleaser to release godownloader
 * #12 Use godownloader to download godownloader
 * Vendor dependencies
diff --git a/main.go b/main.go
index 67469d9..aaeedb1 100644
--- a/main.go
+++ b/main.go
@@ -24,7 +24,6 @@ FORMAT={{ .Archive.Format }}
 OWNER={{ $.Release.GitHub.Owner }}
 REPO={{ $.Release.GitHub.Name }}
 BINDIR=${BINDIR:-./bin}
-test -z "$TMPDIR" && TMPDIR="$(mktemp -d)"
 
 VERSION=$1
 if [ -z "${VERSION}" ]; then
@@ -81,29 +80,45 @@ if [ "${VERSION}" = "latest" ]; then
    fi
 fi
 
+# if version starts with 'v', remove it
 VERSION=${VERSION#v}
 
 OS=$(uname -s)
 ARCH=$(uname -m)
 
-{{ with .Archive.Replacements }}
+# change format (tar.gz or zip) based on ARCH
+{{- with .Archive.FormatOverrides }}
+case ${ARCH} in
+{{- range . }}
+{{ .Goos }}) FORMAT={{ .Format }} ;;
+esac
+{{- end }}
+{{- end }}
+
+# adjust archive name based on OS
+{{- with .Archive.Replacements }}
 case ${OS} in 
 {{- range $k, $v := . }}
 {{ $k }}) OS={{ $v }} ;;
 {{- end }}
 esac
 
+# adjust archive name based on ARCH
 case ${ARCH} in
 {{- range $k, $v := . }}
 {{ $k }}) ARCH={{ $v }} ;;
 {{- end }}
 esac
-{{ end }}
+{{- end }}
 
 {{ .Archive.NameTemplate }}
 TARBALL=${NAME}.${FORMAT}
 URL=https://github.com/${OWNER}/${REPO}/releases/download/v${VERSION}/${TARBALL}
 
+# Destructive operations start here
+#
+#
+test -z "$TMPDIR" && TMPDIR="$(mktemp -d)"
 mkdir -p ${TMPDIR}
 rm -f ${TMPDIR}/${TARBALL}
 download ${TMPDIR}/${TARBALL} ${URL}
@@ -250,6 +265,14 @@ func Load(repo string, file string) (*config.Project, error) {
 	}
 	project.Archive.Replacements = rmap
 
+	// do something similar for format over-rides
+	for i := 0; i < len(project.Archive.FormatOverrides); i++ {
+		goos := project.Archive.FormatOverrides[i].Goos
+		newos := uname[goos]
+		if newos != "" {
+			project.Archive.FormatOverrides[i].Goos = newos
+		}
+	}
 	return project, nil
 }
 
diff --git a/samples/godownloader-goreleaser.sh b/samples/godownloader-goreleaser.sh
index 1fba52e..48f8435 100644
--- a/samples/godownloader-goreleaser.sh
+++ b/samples/godownloader-goreleaser.sh
@@ -7,7 +7,6 @@ FORMAT=tar.gz
 OWNER=goreleaser
 REPO=goreleaser
 BINDIR=${BINDIR:-./bin}
-test -z "$TMPDIR" && TMPDIR="$(mktemp -d)"
 
 VERSION=$1
 if [ -z "${VERSION}" ]; then
@@ -64,18 +63,28 @@ if [ "${VERSION}" = "latest" ]; then
    fi
 fi
 
+# if version starts with 'v', remove it
 VERSION=${VERSION#v}
 
 OS=$(uname -s)
 ARCH=$(uname -m)
 
+# change format (tar.gz or zip) based on arch
+case ${ARCH} in
+Windows) FORMAT=zip ;;
+esac
 
+# adjust archive name based on OS
 
 if [ ! -z "${ARM}" ]; then ARM="v$ARM"; fi
 NAME=${BINARY}_${OS}_${ARCH}${ARM}
 TARBALL=${NAME}.${FORMAT}
 URL=https://github.com/${OWNER}/${REPO}/releases/download/v${VERSION}/${TARBALL}
 
+# Destructive operations start here
+#
+#
+test -z "$TMPDIR" && TMPDIR="$(mktemp -d)"
 mkdir -p ${TMPDIR}
 rm -f ${TMPDIR}/${TARBALL}
 download ${TMPDIR}/${TARBALL} ${URL}
diff --git a/samples/godownloader-hugo.sh b/samples/godownloader-hugo.sh
index 3b36fad..17a3175 100644
--- a/samples/godownloader-hugo.sh
+++ b/samples/godownloader-hugo.sh
@@ -7,7 +7,6 @@ FORMAT=tar.gz
 OWNER=spf13
 REPO=hugo
 BINDIR=${BINDIR:-./bin}
-test -z "$TMPDIR" && TMPDIR="$(mktemp -d)"
 
 VERSION=$1
 if [ -z "${VERSION}" ]; then
@@ -64,12 +63,18 @@ if [ "${VERSION}" = "latest" ]; then
    fi
 fi
 
+# if version starts with 'v', remove it
 VERSION=${VERSION#v}
 
 OS=$(uname -s)
 ARCH=$(uname -m)
 
+# change format (tar.gz or zip) based on arch
+case ${ARCH} in
+Windows) FORMAT=zip ;;
+esac
 
+# adjust archive name based on OS
 case ${OS} in
 Darwin) OS=macOS ;;
 arm) OS=ARM ;;
@@ -79,6 +84,7 @@ i386) OS=32bit ;;
 x86_64) OS=64bit ;;
 esac
 
+# adjust archive name based on ARCH
 case ${ARCH} in
 Darwin) ARCH=macOS ;;
 arm) ARCH=ARM ;;
@@ -88,11 +94,14 @@ i386) ARCH=32bit ;;
 x86_64) ARCH=64bit ;;
 esac
 
-
 NAME=${BINARY}_${VERSION}_${OS}-${ARCH}
 TARBALL=${NAME}.${FORMAT}
 URL=https://github.com/${OWNER}/${REPO}/releases/download/v${VERSION}/${TARBALL}
 
+# Destructive operations start here
+#
+#
+test -z "$TMPDIR" && TMPDIR="$(mktemp -d)"
 mkdir -p ${TMPDIR}
 rm -f ${TMPDIR}/${TARBALL}
 download ${TMPDIR}/${TARBALL} ${URL}