diff --git a/install-github-release.sh b/install-github-release.sh
index 6511378..ad74695 100755
--- a/install-github-release.sh
+++ b/install-github-release.sh
@@ -6,7 +6,7 @@ DEFAULT_MATCH_STAGE_1="browser_download_url"
 
 
 main(){
-    if [ -z "$REPO" ]; then
+    if [ -z $REPO ]; then
         usage
         exit 1
     fi
@@ -54,6 +54,10 @@ main(){
             curl $SET_PROXY -SfLo source_pkg.zip "$dl_url"
             unzip -o source_pkg.zip
             dirname=$(rev <<< $pkgname | cut -d '.' -f 2- | rev)
+        elif (echo $ext | grep -i tar) || (echo $ext | grep -i tgz) >/dev/null 2>&1; then
+            curl $SET_PROXY -SfLo source_pkg.$ext "$dl_url"
+            tar -xvf source_pkg.$ext
+            dirname=$(rev <<< $pkgname | cut -d '.' -f 2- | rev)
         elif (echo $ext_tar | grep -i tar) >/dev/null 2>&1; then
             curl $SET_PROXY -SfLo source_pkg.tar.$ext "$dl_url"
             tar -xvf source_pkg.tar.$ext
@@ -62,19 +66,20 @@ main(){
             echo "Unknown format: $pkgname"
             exit 1
         fi
+        rm source_pkg.*
         if [ ! -z $PKG_DIR ]; then
             if [ "$PKG_DIR" = "-" ]; then
                 if [ -z $SED_EXP ]; then
-                    cd $dirname
+                    cd "$dirname"
                 else
-                    cd $(echo $dirname | sed $SED_EXP)
+                    cd "$(echo $dirname | sed -E $SED_EXP)"
                 fi
             elif [ $PKG_DIR -ge 0 ]; then
                 dirs=$(ls -l|awk '/^d/ {print $NF}')
                 arr_dirs=($dirs)
-                cd ${arr_dirs[$PKG_DIR]}
+                cd "${arr_dirs[$PKG_DIR]}"
             else
-                cd $PKG_DIR
+                cd "$PKG_DIR"
             fi
         fi
 
@@ -104,7 +109,7 @@ main(){
         popd >/dev/null
         rm -rf "$tmp_dir"
 
-        if [ ! -z "$CMD_RELOAD" ]; then
+        if [ ! -z $CMD_RELOAD ]; then
             $CMD_RELOAD
         fi
     fi