diff --git a/instalador-firma-digital.sh b/instalador-firma-digital.sh
index a74c1a1..6f32102 100644
--- a/instalador-firma-digital.sh
+++ b/instalador-firma-digital.sh
@@ -5,14 +5,14 @@
 #   https://fran.cr/instalar-firma-digital-costa-rica-gnu-linux-ubuntu-debian/
 
 urlencode() {
-    ENCODEDURL="$(tr -d '\n' | curl -Gs -w %{url_effective} --data-urlencode @- ./ ||: | sed "s/%0[aA]$//;s/^[^?]*?\(.*\)/\1/")"
-    printf '%s' "$ENCODEDURL" | sed 's/^http.*?//g'
+    ENCODEDURL="$(curl -Gs -w %{url_effective} --data-urlencode @- ./ ||: )"
+    printf '%s' "$ENCODEDURL" | sed 's/%0[aA]$//;s/^.*[?]//'
 }
 
 get_asp_var() {
     VARS="$@" ; i=0
     for VAR in $VARS ; do
-        VAL="$(printf '%s' "$RESPONSE" | grep -o "id=\"$VAR\"\svalue=\".*\"" | cut -d '"' -f 4 | urlencode)"
+        VAL="$(printf '%s' "$RESPONSE" | grep "id=\"$VAR\"" | cut -d '"' -f 8 | urlencode)"
         [ "$i" != 0 ] && printf '&'
         printf '%s=%s' "$VAR" "$VAL"
         i=+1
@@ -76,6 +76,26 @@ download_iso() {
     printf '%s' "$RESPONSE"
 }
 
+term_prompt() {
+    TITLE="$1" ; PROMPT="$2" ; MODE="$3" ; LIST="$4"
+
+    if [ "$MODE" = "info" ] ; then
+        printf '\n\033[1m\033[34m=== %s ===\033[0m\n%s ENTER' "$TITLE" "$PROMPT"
+    fi
+
+    if [ "$MODE" = "entry" ] ; then
+        printf '\n\033[1m\033[34m=== %s ===\033[0m\n%s\n -> ' "$TITLE" "$PROMPT"
+    fi
+
+    if [ "$MODE" = "list" ] ; then
+        printf '\n\033[1m\033[34m=== %s ===\033[0m\n%s (1, 2, 3, ...)\n%s\n -> ' "$TITLE" "$PROMPT" "$LIST"
+    fi
+
+    if [ "$MODE" = "error" ] ; then
+        printf '\n\033[1m\033[31m=== %s ===\033[0m\n%s\n' "$TITLE" "$PROMPT"
+    fi
+}
+
 set_file() {
     FILE="$1"
 
@@ -170,9 +190,43 @@ if [ -e "/bin/zenity" ] ; then
 
     # Download file & show progress
     (while true ; do 
-        DOWN="$(du "$SAVE_FILE" 2>/dev/null | grep -o '^[0-9]*')"
+        DOWN="$(du "$SAVE_FILE" 2>/dev/null | awk '{print $1}')"
         r=$(((DOWN*10000)/SIZE))
         printf '%d\n' ${r%??}
         sleep 0.5
     done | zenity --title "$TITLE" --text "$PROMPT_DOWNLOAD" --progress) & curl "$DOWNLOAD_URL" -o "$SAVE_FILE"
+else
+    # Welcome
+    term_prompt "$TITLE" "$PROMPT_WELCOME" info && read -r NULL
+
+    # Select file to be downloaded
+    LIST="$(printf '\033[4m1\033[0m - ClientesMac_rev34.zip           | macOSX 10.14 o superior
+\033[4m2\033[0m - ClientesLinux_DEB64_Rev25.zip   | Ubuntu 18.04 LTS o superior, Debian 10
+\033[4m3\033[0m - ClientesLinux_CentOS7_Rev6.zip  | CentOS 7
+\033[4m4\033[0m - ClientesLinux_RPM64_Rev24.zip   | Fedora 34 o superior, CentOS Stream 9')"
+    term_prompt "$TITLE" "$PROMPT_FILE" list "$LIST" && read -r FILE
+    [ "$FILE" = "1" ] && FILE="ClientesMac_rev34.zip"
+    [ "$FILE" = "2" ] && FILE="ClientesLinux_DEB64_Rev25.zip"
+    [ "$FILE" = "3" ] && FILE="ClientesLinux_CentOS7_Rev6.zip"
+    [ "$FILE" = "4" ] && FILE="ClientesLinux_RPM64_Rev24.zip"
+
+    # Set file to be downloaded
+    set_file "$FILE"
+
+    # Ask for serial number
+    term_prompt "$TITLE" "$PROMPT_SERIAL" entry && read -r SERIAL
+    [ -z "$SERIAL" ] && term_prompt "$TITLE" "$PROMPT_ERR_SERIAL" error && exit 1
+
+    # Generate tempkey & Define DOWNLOAD_URL
+    TEMPKEY="$(download_iso "$SERIAL" | sed '/tempkey/!d;s/.*tempkey=//g;s/".*$//g')"
+    [ -z "$TEMPKEY" ] && term_prompt "$TITLE" "$PROMPT_ERR_DOWNLOAD" error && exit 1
+    DOWNLOAD_URL="https://soportefirmadigital.com/sfdj/getiso.aspx?tempkey=$TEMPKEY"
+    
+    # Define where to save file
+    mkdir -p "$HOME/Library/Caches/TemporaryItems/instalador-firma-digital"
+    SAVE_FILE="$HOME/Library/Caches/TemporaryItems/instalador-firma-digital/$FILE"
+
+    # Download file & show progress
+    term_prompt "$TITLE" "$PROMPT_DOWNLOAD" info && echo
+    curl "$DOWNLOAD_URL" -o "$SAVE_FILE" --progress-bar
 fi