Improve xpui detection

- checks for existence of `xpui.spa` before attempting any other xpui handling.

install.sh

@@ -96,8 +96,12 @@ echo "SpotX-Linux by @SpotX-CLI"
 echo "**************************"
 echo
 
-# Handle xpui.bak and FORCE_FLAG logic
-if [[ "${FORCE_FLAG}" == "false" ]]; then
+# xpui detection
+if [[ ! -f "${XPUI_SPA}" ]]; then
+  echo "xpui not found, skipping xpui patches..."
+  XPUI_SKIP="true"
+else
+  if [[ "${FORCE_FLAG}" == "false" ]]; then
     if [[ -f "${XPUI_BAK}" ]]; then
       echo "SpotX backup found, SpotX has already been used on this install."
       echo -e "Re-run SpotX using the '-f' flag to force xpui patching.\n"
@@ -107,7 +111,7 @@ if [[ "${FORCE_FLAG}" == "false" ]]; then
       echo "Creating xpui backup..."
       cp "${XPUI_SPA}" "${XPUI_BAK}"
       XPUI_SKIP="false"; fi
-else
+  else
     if [[ -f "${XPUI_BAK}" ]]; then
       echo "Backup xpui found, restoring original..."
       rm "${XPUI_SPA}"
@@ -116,7 +120,7 @@ else
     else
       echo "Creating xpui backup..."
       cp "${XPUI_SPA}" "${XPUI_BAK}"
-    XPUI_SKIP="false"; fi; fi
+      XPUI_SKIP="false"; fi; fi; fi
 
 # Extract xpui.spa
 if [[ "${XPUI_SKIP}" == "false" ]]; then