diff --git a/lch b/lch
index d5c9dac..7b8f9ba 100755
--- a/lch
+++ b/lch
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-VERSION=0.5r2
+VERSION=0.5r4
 DEST=$1
 shift 1
 ORIG=$@
@@ -9,7 +9,6 @@ if [[ -e /usr/lib/lch/compressor.sh ]]; then . /usr/lib/lch/compressor.sh; else
 if [[ -e /usr/lib/lch/decompressor.sh ]]; then . /usr/lib/lch/decompressor.sh; else . ./lib/decompressor.sh; fi
 if [[ -e /usr/lib/lch/installer.sh ]]; then . /usr/lib/lch/installer.sh; else . ./lib/installer.sh; fi
 
-
 if [ "$DEST" = "--version" ] || [ "$DEST" = "-v" ]
 then
     echo "Linux Compression Humanized $VERSION"
diff --git a/lch.1 b/lch.1
index 1c7eb96..d39da4a 100644
--- a/lch.1
+++ b/lch.1
@@ -1,4 +1,4 @@
-.TH LCH 1 "29 September 2020"
+.TH LCH 1 "03 October 2020"
 .SH NAME
 lch \- command\-line compressor and decompressor for humans
 .SH SYNOPSIS
@@ -10,9 +10,14 @@ lch \- command\-line compressor and decompressor for humans
 simplicity in mind. Automatically select the compression format by file
 extension.
 
-    Supported extensions:
-
-    rar, tar, tar.gz, tar.bz2, tar.xz, bz2, tgz, gz, zip, 7z
+    Packing/unpacking supported extensions:
+      7z, bz2, gz, rar, tar, tar.bz2, tar.gz, tar.xz, tgz, zip
+    
+    Unpacking only supported extensions:
+      arj, cab, dmg, iso, lzh, lzma, rpm, SquashFS
+    
+    Unpacking only in beta extensions:
+      cdi, chd, vmdk, win, xar, z
 
 .SH OPTIONS
 .TP
diff --git a/lib/compressor.sh b/lib/compressor.sh
index f19e85e..362b32e 100644
--- a/lib/compressor.sh
+++ b/lib/compressor.sh
@@ -4,31 +4,76 @@ function compressor()
 {
     case $(lowercase) in
         *.tar)
-            tar -cvf $DEST $ORIG
+            if [ -x "$(command -v tar)" ]
+            then
+                tar -cvf $DEST $ORIG
+            else
+                error_not_install "tar"
+            fi
         ;;
         *.tar.gz | *.tgz)
-            tar -czvf $DEST $ORIG
+            if [ -x "$(command -v tar)" ]
+            then
+                tar -czvf $DEST $ORIG
+            else
+                error_not_install "tar"
+            fi
         ;;
         *.tar.bz2 | *.tbz | *.tbz2 | *.tb2)
-            tar -c $ORIG | bzip2 > $DEST
+            if [ -x "$(command -v tar)" ]
+            then
+                tar -c $ORIG | bzip2 > $DEST
+            else
+                error_not_install "tar"
+            fi
         ;;
         *.tar.xz | *.txz)
-            tar -cJf $DEST $ORIG
+            if [ -x "$(command -v tar)" ]
+            then
+                tar -cJf $DEST $ORIG
+            else
+                error_not_install "tar"
+            fi
         ;;
         *.bz2)
-            bzip2 -c $ORIG > $DEST
+            if [ -x "$(command -v bzip2)" ]
+            then
+                bzip2 -c $ORIG > $DEST
+            else
+                error_not_install "bzip2"
+            fi
         ;;
         *.gz)
-            gzip -c $ORIG > $DEST
+            if [ -x "$(command -v gzip)" ]
+            then
+                gzip -c $ORIG > $DEST
+            else
+                error_not_install "gzip"
+            fi
         ;;
         *.zip)
-            zip -r $DEST $ORIG
+            if [ -x "$(command -v zip)" ]
+            then
+                zip -r $DEST $ORIG
+            else
+                error_not_install "zip"
+            fi
         ;;
         *.7z)
-            7za a $DEST $ORIG
+            if [ -x "$(command -v 7z)" ]
+            then
+                7z a $DEST $ORIG
+            else
+                error_not_install "7z"
+            fi
         ;;
         *.rar)
-            rar a $DEST $ORIG
+            if [ -x "$(command -v rar)" ]
+            then
+                rar a $DEST $ORIG
+            else
+                error_not_install "rar"
+            fi
         ;;
         *)
             echo "Extension not found."
diff --git a/lib/decompressor.sh b/lib/decompressor.sh
index d308812..0550807 100644
--- a/lib/decompressor.sh
+++ b/lib/decompressor.sh
@@ -4,31 +4,76 @@ function decompressor()
 {
     case $(lowercase) in
         *.tar)
-            tar -xvf $DEST
+            if [ -x "$(command -v tar)" ]
+            then
+                tar -xvf $DEST
+            else
+                error_not_install "tar"
+            fi
         ;;
         *.tar.gz | *.tgz)
-            tar -xzvf $DEST
+            if [ -x "$(command -v tar)" ]
+            then
+                tar -xzvf $DEST
+            else
+                error_not_install "tar"
+            fi
         ;;
         *.tar.bz2 | *.tbz | *.tbz2 | *.tb2)
-            tar xjf $DEST
+            if [ -x "$(command -v tar)" ]
+            then
+                tar xjf $DEST
+            else
+                error_not_install "tar"
+            fi
         ;;
         *.tar.xz | *.txz)
-            tar -xf $DEST
+            if [ -x "$(command -v tar)" ]
+            then
+                tar -xf $DEST
+            else
+                error_not_install "tar"
+            fi
         ;;
         *.bz2)
-            bzip2 -d $DEST
+            if [ -x "$(command -v bzip2)" ]
+            then
+                bzip2 -d $DEST
+            else
+                error_not_install "bzip2"
+            fi
         ;;
         *.gz)
-            gzip -d $DEST
+            if [ -x "$(command -v gzip)" ]
+            then
+                gzip -d $DEST
+            else
+                error_not_install "gzip"
+            fi
         ;;
         *.zip)
-            unzip $DEST
+            if [ -x "$(command -v unzip)" ]
+            then
+                unzip $DEST
+            else
+                error_not_install "unzip"
+            fi
         ;;
-        *.7z)
-            7za e $DEST
+        *.7z | *.arj | *.cab | *.cdi | *.chd | *.dmg | *.iso | *.lzh | *.lzma | *.rpm | *.squashfs | *.vmdk | *.win | *.xar | *.z)
+            if [ -x "$(command -v 7z)" ]
+            then
+                7z e -y $DEST
+            else
+                error_not_install "7z"
+            fi
         ;;
         *.rar)
-            unrar x $DEST
+            if [ -x "$(command -v unrar)" ]
+            then
+                unrar x $DEST
+            else
+                error_not_install "unrar"
+            fi
         ;;
         *)
             echo "Extension not found."
diff --git a/lib/resources.sh b/lib/resources.sh
index cdf27eb..31a5982 100644
--- a/lib/resources.sh
+++ b/lib/resources.sh
@@ -16,8 +16,14 @@ function help()
     echo "$ lch file.zip /home/file      - Compress"
     echo "$ lch files.zip file1 file2    - Compress multiple"
     echo ""
-    echo "Supported extensions:"
-    echo "  rar, tar, tar.gz, tar.bz2, tar.xz, bz2, tgz, gz, zip, 7z"
+    echo "Packing/unpacking supported extensions:"
+    echo "  7z, bz2, gz, rar, tar, tar.bz2, tar.gz, tar.xz, tgz, zip"
+    echo ""
+    echo "Unpacking only supported extensions:"
+    echo "  arj, cab, dmg, iso, lzh, lzma, rpm, SquashFS"
+    echo ""
+    echo "Unpacking only in beta extensions:"
+    echo "  cdi, chd, vmdk, win, xar, z"
     echo ""
     echo "Run 'man lch' for more info."
     echo ""
@@ -50,4 +56,9 @@ function check()
 function lowercase()
 {
     echo "$DEST" | tr 'A-Z' 'a-z'
+}
+
+function error_not_install()
+{
+    echo -e "$@ \e[91mis not Installed\e[0m, use 'lch -i' to install and 'lch -c' to check."
 }
\ No newline at end of file