diff --git a/DnsServerApp.NETCore/install-raspi.sh b/DnsServerApp.NETCore/install-raspi.sh
index 510d3ca6..906f7e30 100644
--- a/DnsServerApp.NETCore/install-raspi.sh
+++ b/DnsServerApp.NETCore/install-raspi.sh
@@ -10,40 +10,45 @@ dnsUrl="https://technitium.com/download/dns/DnsServerPortable.tar.gz"
 
 mkdir -p $dnsDir
 installLog="$dnsDir/install.log"
+echo "" > $installLog
 
 echo ""
 echo "==============================="
 echo "Technitium DNS Server Installer"
 echo "==============================="
-echo ""
-echo "Installing dependencies..."
 
-until apt-get -y update &>> $installLog && apt-get -y install curl libunwind8 gettext apt-transport-https &>> $installLog
-do
-	echo "Trying again.."
-	sleep 2
-done
-
-echo ""
-
-if [ ! -f /usr/bin/dotnet ]
+if [ ! -f /etc/dns/DnsServerApp.dll ]
 then
-	echo "Downloading .NET Core Runtime..."
-	
-	mkdir -p $aspnetcoreDir
-	
-	if wget -q "$aspnetcoreUrl" -O $aspnetcoreTar
+	echo ""
+	echo "Installing dependencies..."
+
+	until apt-get -y update &>> $installLog && apt-get -y install curl libunwind8 gettext apt-transport-https &>> $installLog
+	do
+		echo "Trying again.."
+		sleep 2
+	done
+
+	echo ""
+
+	if [ ! -f /usr/bin/dotnet ]
 	then
-		echo "Installing .NET Core Runtime..."
-		tar -zxf $aspnetcoreTar -C $aspnetcoreDir
-		ln -s $aspnetcoreDir/dotnet /usr/bin
-		echo ".NET Core Runtime was installed succesfully."
+		echo "Downloading .NET Core Runtime..."
+		
+		mkdir -p $aspnetcoreDir
+		
+		if wget -q "$aspnetcoreUrl" -O $aspnetcoreTar
+		then
+			echo "Installing .NET Core Runtime..."
+			tar -zxf $aspnetcoreTar -C $aspnetcoreDir
+			ln -s $aspnetcoreDir/dotnet /usr/bin
+			echo ".NET Core Runtime was installed succesfully."
+		else
+			echo "Failed to download .NET Core Runtime from: $aspnetcoreUrl"
+			exit 1
+		fi
 	else
-		echo "Failed to download .NET Core Runtime from: $aspnetcoreUrl"
-		exit 1
+		echo ".NET Core Runtime was found installed."
 	fi
-else
-	echo ".NET Core Runtime was found installed."
 fi
 
 echo ""
@@ -51,27 +56,45 @@ echo "Downloading Technitium DNS Server..."
 
 if wget -q "$dnsUrl" -O $dnsTar
 then
-	echo "Installing Technitium DNS Server..."
+	if [ -f /etc/dns/DnsServerApp.dll ]
+	then
+		echo "Updating Technitium DNS Server..."
+	else
+		echo "Installing Technitium DNS Server..."
+	fi
+	
 	tar -zxf $dnsTar -C $dnsDir
 	
 	if [ "$(ps --no-headers -o comm 1 | tr -d '\n')" = "systemd" ] 
 	then
-		echo "Configuring systemd service..."
-		cp $dnsDir/systemd.service /etc/systemd/system/dns.service
-		systemctl enable dns.service &>> $installLog
-		systemctl start dns.service &>> $installLog
+		if [ -f /etc/systemd/system/dns.service ]
+		then
+			echo "Restarting systemd service..."
+			systemctl restart dns.service &>> $installLog
+		else
+			echo "Configuring systemd service..."
+			cp $dnsDir/systemd.service /etc/systemd/system/dns.service
+			systemctl enable dns.service &>> $installLog
+			systemctl start dns.service &>> $installLog
+		fi
 	else
-		echo "Installing supervisor..."
-		
-		until apt-get -y install supervisor &>> $installLog
-		do
-			echo "Trying again.."
-			sleep 2
-		done
-		
-		echo "Configuring supervisor service..."
-		cp $dnsDir/supervisor.conf /etc/supervisor/conf.d/dns.conf
-		service supervisor restart &>> $installLog
+		if [ -f /etc/supervisor/conf.d/dns.conf ]
+		then
+			echo "Restarting supervisor service..."
+			service supervisor restart &>> $installLog
+		else
+			echo "Installing supervisor..."
+			
+			until apt-get -y install supervisor &>> $installLog
+			do
+				echo "Trying again.."
+				sleep 2
+			done
+			
+			echo "Configuring supervisor service..."
+			cp $dnsDir/supervisor.conf /etc/supervisor/conf.d/dns.conf
+			service supervisor restart &>> $installLog
+		fi
 	fi
 	
 	echo ""
diff --git a/DnsServerApp.NETCore/install-ubuntu.sh b/DnsServerApp.NETCore/install-ubuntu.sh
index 9575b4bf..fb65c9ae 100644
--- a/DnsServerApp.NETCore/install-ubuntu.sh
+++ b/DnsServerApp.NETCore/install-ubuntu.sh
@@ -10,40 +10,45 @@ dnsUrl="https://technitium.com/download/dns/DnsServerPortable.tar.gz"
 
 mkdir -p $dnsDir
 installLog="$dnsDir/install.log"
+echo "" > $installLog
 
 echo ""
 echo "==============================="
 echo "Technitium DNS Server Installer"
 echo "==============================="
-echo ""
-echo "Installing dependencies..."
 
-until apt-get -y update &>> $installLog && apt-get -y install libunwind8 icu-devtools apt-transport-https &>> $installLog
-do
-	echo "Trying again.."
-	sleep 2
-done
-
-echo ""
-
-if [ ! -f /usr/bin/dotnet ]
+if [ ! -f /etc/dns/DnsServerApp.dll ]
 then
-	echo "Downloading .NET Core Runtime..."
-	
-	mkdir -p $aspnetcoreDir
-	
-	if wget -q "$aspnetcoreUrl" -O $aspnetcoreTar
+	echo ""
+	echo "Installing dependencies..."
+
+	until apt-get -y update &>> $installLog && apt-get -y install libunwind8 icu-devtools apt-transport-https &>> $installLog
+	do
+		echo "Trying again.."
+		sleep 2
+	done
+
+	echo ""
+
+	if [ ! -f /usr/bin/dotnet ]
 	then
-		echo "Installing .NET Core Runtime..."
-		tar -zxf $aspnetcoreTar -C $aspnetcoreDir
-		ln -s $aspnetcoreDir/dotnet /usr/bin
-		echo ".NET Core Runtime was installed succesfully."
+		echo "Downloading .NET Core Runtime..."
+		
+		mkdir -p $aspnetcoreDir
+		
+		if wget -q "$aspnetcoreUrl" -O $aspnetcoreTar
+		then
+			echo "Installing .NET Core Runtime..."
+			tar -zxf $aspnetcoreTar -C $aspnetcoreDir
+			ln -s $aspnetcoreDir/dotnet /usr/bin
+			echo ".NET Core Runtime was installed succesfully."
+		else
+			echo "Failed to download .NET Core Runtime from: $aspnetcoreUrl"
+			exit 1
+		fi
 	else
-		echo "Failed to download .NET Core Runtime from: $aspnetcoreUrl"
-		exit 1
+		echo ".NET Core Runtime was found installed."
 	fi
-else
-	echo ".NET Core Runtime was found installed."
 fi
 
 echo ""
@@ -51,27 +56,45 @@ echo "Downloading Technitium DNS Server..."
 
 if wget -q "$dnsUrl" -O $dnsTar
 then
-	echo "Installing Technitium DNS Server..."
+	if [ -f /etc/dns/DnsServerApp.dll ]
+	then
+		echo "Updating Technitium DNS Server..."
+	else
+		echo "Installing Technitium DNS Server..."
+	fi
+	
 	tar -zxf $dnsTar -C $dnsDir
 	
 	if [ "$(ps --no-headers -o comm 1 | tr -d '\n')" = "systemd" ] 
 	then
-		echo "Configuring systemd service..."
-		cp $dnsDir/systemd.service /etc/systemd/system/dns.service
-		systemctl enable dns.service &>> $installLog
-		systemctl start dns.service &>> $installLog
+		if [ -f /etc/systemd/system/dns.service ]
+		then
+			echo "Restarting systemd service..."
+			systemctl restart dns.service &>> $installLog
+		else
+			echo "Configuring systemd service..."
+			cp $dnsDir/systemd.service /etc/systemd/system/dns.service
+			systemctl enable dns.service &>> $installLog
+			systemctl start dns.service &>> $installLog
+		fi
 	else
-		echo "Installing supervisor..."
-		
-		until apt-get -y install supervisor &>> $installLog
-		do
-			echo "Trying again.."
-			sleep 2
-		done
-		
-		echo "Configuring supervisor service..."
-		cp $dnsDir/supervisor.conf /etc/supervisor/conf.d/dns.conf
-		service supervisor restart &>> $installLog
+		if [ -f /etc/supervisor/conf.d/dns.conf ]
+		then
+			echo "Restarting supervisor service..."
+			service supervisor restart &>> $installLog
+		else
+			echo "Installing supervisor..."
+			
+			until apt-get -y install supervisor &>> $installLog
+			do
+				echo "Trying again.."
+				sleep 2
+			done
+			
+			echo "Configuring supervisor service..."
+			cp $dnsDir/supervisor.conf /etc/supervisor/conf.d/dns.conf
+			service supervisor restart &>> $installLog
+		fi
 	fi
 	
 	echo ""