diff --git a/install.sh b/install.sh
index 091f832..8bad9c2 100755
--- a/install.sh
+++ b/install.sh
@@ -50,36 +50,37 @@ set +eux
 
 # Install Oh-My-zsh if not installed
 if [ ! -f ~/.zshrc ]; then
-  sh -c "$(curl -fsSL https://raw.github.com/robbyrussell/oh-my-zsh/master/tools/install.sh)"
+  sh -c "$(curl -fsSL https://raw.github.com/robbyrussell/oh-my-zsh/master/tools/install.sh)" | sh
 fi
 
 # Enable exit on error
 set -eux
 
-# Remove old config file
-rm -rf ~/.zshrc
+# Backup old config file if it exists
+if [ -f ~/.zshrc ]; then
+    mv ~/.zshrc ~/.zshrc.backup
+fi
 
-# Replace config file
-touch ~/.zshrc
-echo "$(curl https://raw.githubusercontent.com/alvinlollo/Single-install-script/refs/heads/main/configs/.zshrc)" >> ~/.zshrc
+# Download and replace config file
+curl -fsSL https://raw.githubusercontent.com/alvinlollo/Single-install-script/refs/heads/main/configs/.zshrc -o ~/.zshrc
 
 # [zsh-history-substring-search](https://github.com/zsh-users/zsh-history-substring-search)
-if [ ! -d ~/.oh-my-zsh/custom/plugins/zsh-history-substring-search ]; then
+if [ ! -d ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/plugins/zsh-history-substring-search ]; then
     git clone https://github.com/zsh-users/zsh-history-substring-search ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/plugins/zsh-history-substring-search
 fi
 
 # [zsh-autosuggestions](https://github.com/zsh-users/zsh-autosuggestions)
-if [ ! -d ~/.oh-my-zsh/custom/plugins/zsh-autosuggestions ];then
-    git clone https://github.com/zsh-users/zsh-autosuggestions "${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/plugins/zsh-autosuggestions"
+if [ ! -d ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/plugins/zsh-autosuggestions ];then
+    git clone https://github.com/zsh-users/zsh-autosuggestions ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/plugins/zsh-autosuggestions
 fi
 
 # [zsh-eza](https://github.com/z-shell/zsh-eza)
-if [ ! -d ~/.oh-my-zsh/custom/plugins/zsh-eza ]; then
+if [ ! -d ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/plugins/zsh-eza ]; then
     git clone https://github.com/z-shell/zsh-eza.git ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/plugins/zsh-eza
 fi
 
 # [fzf-zsh-plugin](https://github.com/unixorn/fzf-zsh-plugin)
-if [ ! -d ~/.oh-my-zsh/custom/plugins/fzf-zsh-plugin ]; then
+if [ ! -d ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/plugins/fzf-zsh-plugin ]; then
     git clone --depth 1 https://github.com/unixorn/fzf-zsh-plugin.git ${ZSH_CUSTOM:-~/.oh-my-zsh/custom}/plugins/fzf-zsh-plugin
 fi