Replaced Windscribe with PIA and fixed Microsoft fonts installation

postinstall.sh

@@ -173,7 +173,7 @@ install_fonts() {
     if rpm -q msttcore-fonts-installer > /dev/null 2>&1; then
         log_warn "Microsoft Core Fonts already installed."
     else
-        sudo rpm -i https://downloads.sourceforge.net/project/mscorefonts2/rpms/msttcore-fonts-installer-2.6-1.noarch.rpm
+        sudo dnf install -y https://downloads.sourceforge.net/project/mscorefonts2/rpms/msttcore-fonts-installer-2.6-1.noarch.rpm
         check_status "Microsoft Core Fonts installation" "non-critical"
     fi