Try apps list first

src/freedombone-utils-selector

 
 function app_is_installed {
     app_name="$1"
-    if [ ! -f $COMPLETION_FILE ]; then
-        echo "0"
-        return
-    fi
-
-    if [ -f /usr/share/${PROJECT_NAME}/installed.txt ]; then
-        if ! grep -Fxq "install_${app_name}" /usr/share/${PROJECT_NAME}/installed.txt; then
+    INSTALLED_APPS_LIST=/usr/share/${PROJECT_NAME}/installed.txt
+    if [ -f $INSTALLED_APPS_LIST ]; then
+        if ! grep -Fxq "install_${app_name}" $INSTALLED_APPS_LIST; then
             echo "0"
         else
             echo "1"
         return
     fi
 
+    if [ ! -f $COMPLETION_FILE ]; then
+        echo "0"
+        return
+    fi
+
     if ! grep -Fxq "install_${app_name}" $COMPLETION_FILE; then
         echo "0"
     else