add kindle previewer 4 warning

README.md

@@ -183,7 +183,11 @@ You'll need to install various tools to access important but optional features.
 
 ### KindleGen
 
-On Windows and macOS, install [Kindle Previewer](https://www.amazon.com/Kindle-Previewer/b?ie=UTF8&node=21381691011) and `kindlegen` will be autodetected from it.
+On Windows and macOS, install Kindle Previewer and `kindlegen` will be autodetected from it.
+
+> [!WARNING]
+> On Sept 14, 2026, Kindle Previewer was updated to version 4, which made kindlegen harder to use.
+> In the meantime, please download the older version 3: https://web.archive.org/web/20260819184257/https://kdp.amazon.com/en_US/help/topic/G202131170
 
 If you have issues detecting it, get stuck on the MOBI conversion step, or use Linux AppImage or Flatpak, refer to the wiki: https://github.com/ciromattia/kcc/wiki/Installation#kindlegen
 

kcc.py

@@ -33,6 +33,7 @@ def modify_path():
         mac_paths = [
             '/Applications/Kindle Comic Creator/Kindle Comic Creator.app/Contents/MacOS',
             '/Applications/Kindle Previewer 3.app/Contents/lib/fc/bin/',
+            '/Applications/Kindle Previewer 4.app/Contents/Resources/KFXGen/bin/'
         ]
         if getattr(sys, 'frozen', False):
             os.environ['PATH'] += os.pathsep + os.pathsep.join(mac_paths +

kindlecomicconverter/KCC_gui.py

@@ -418,6 +418,7 @@ class WorkerThread(QThread):
             if GUI.jobList.item(i).icon().isNull():
                 currentJobs.append(str(GUI.jobList.item(i).text()))
         GUI.jobList.clear()
+        fusion_cover_path = None
         if options.filefusion:
             bookDir = []
             MW.addMessage.emit('Attempting file fusion', 'info', False)
@@ -429,7 +430,8 @@ class WorkerThread(QThread):
                 if options.output is None:
                     options.output = fusion_source_parent
                 currentJobs.clear()
-                currentJobs.append(comic2ebook.makeFusion(bookDir))
+                job, fusion_cover_path = comic2ebook.makeFusion(bookDir)
+                currentJobs.append(job)
                 MW.addMessage.emit('Created fusion at ' + currentJobs[0], 'info', False)
             except Exception as e:
                 print('Fusion Failed. ' + str(e))
@@ -463,7 +465,7 @@ class WorkerThread(QThread):
             jobargv.append(job)
             try:
                 comic2ebook.options = comic2ebook.checkOptions(copy(options))
-                outputPath = comic2ebook.makeBook(job, self, job_progress_number)
+                outputPath = comic2ebook.makeBook(job, fusion_cover_path, self, job_progress_number)
                 MW.hideProgressBar.emit()
             except UserWarning as warn:
                 if not self.conversionAlive:
@@ -1405,7 +1407,7 @@ class KCCGUI(KCC_ui.Ui_mainWindow):
         except OSError as e:
             self.kindleGen = False
             if startup:
-                error = f"kindlegen: {e.strerror}\n\n Re-install Rosetta/Kindle Previewer/other Intel app?\n\nPlease email Amazon to make Kindle Previewer Apple silicon native at amazon.com/kindle-help"
+                error = f"kindlegen: {e.strerror}\n\n Re-install or re-open Rosetta/Kindle Previewer/other Intel app?"
                 self.showDialog(error, 'error')
 
     def __init__(self, kccapp, kccwindow):

kindlecomicconverter/comic2ebook.py

@@ -77,9 +77,10 @@ def main(argv=None):
     if len(sources) == 0:
         print('No matching files found.')
         return 1
+    fusion_cover_path = None
     if options.filefusion:
         fusion_source_parent = str(Path(sources[0]).parent)
-        fusion_path = makeFusion(list(sources))
+        fusion_path, fusion_cover_path = makeFusion(list(sources))
         sources.clear()
         sources.append(fusion_path)
     for source in sources:
@@ -89,7 +90,7 @@ def main(argv=None):
             options.output = fusion_source_parent
         options = checkOptions(options)
         print('Working on ' + source + '...')
-        makeBook(source)
+        makeBook(source, fusion_cover_path)
 
     return 0
 
@@ -1755,8 +1756,7 @@ def checkTools(source):
             sys.exit(1)
         except OSError as e:
             print(f"kindlegen: {e.strerror}")
-            print('Re-install Rosetta/Kindle Previewer/other Intel app?')
-            print('Please email Amazon to make Kindle Previewer Apple silicon native at amazon.com/kindle-help')
+            print('Re-install or re-open Rosetta/Kindle Previewer/other Intel app?')
             sys.exit(1)
 
 
@@ -1773,6 +1773,19 @@ def makeFusion(sources: List[str]):
     start = perf_counter()
     first_path = Path(sources[0])
 
+    fusion_cover_path = None
+    if first_path.parent.joinpath('Covers').is_dir():
+        covers = os.listdir(first_path.parent.joinpath('Covers'))
+        filtered_covers = []
+        for cover in covers:
+            _, cover_ext = getImageFileName(cover)
+            if cover_ext in IMAGE_TYPES:
+                filtered_covers.append(cover)
+        try:
+            fusion_cover_path = first_path.parent.joinpath('Covers', filtered_covers[0])
+        except IndexError:
+            pass
+
     if options.tempdir:
         fusion_parent = first_path.parent
     else:
@@ -1814,10 +1827,10 @@ def makeFusion(sources: List[str]):
     print(f"makefusion: {end - start} seconds")
     print("Combined File: "+ str(fusion_path))
     
-    return str(fusion_path)
+    return str(fusion_path), fusion_cover_path
 
 
-def makeBook(source, qtgui=None, job_progress=''):
+def makeBook(source, fusion_cover_path=None, qtgui=None, job_progress=''):
     start = perf_counter()
     global GUI
     GUI = qtgui
@@ -1912,9 +1925,12 @@ def makeBook(source, qtgui=None, job_progress=''):
             options.customcover = True
         except IndexError:
             pass
+    if fusion_cover_path:
+        options.customcover = True
+        cover_path = fusion_cover_path
 
     cover = None
-    if not options.webtoon:
+    if not options.webtoon or options.customcover:
         cover = image.Cover(cover_path, options)
 
     x, y = image.ProfileData.Profiles[options.profile][1]

requirements-docker.txt

@@ -1,7 +1,7 @@
 Pillow>=11.3.0
 psutil>=7.2.2
 requests>=2.34.2
-python-slugify>=9.0.0
+python-slugify>=8.0.4
 packaging>=26.2
 mozjpeg-lossless-optimization>=1.2.0
 natsort>=8.4.0

requirements-osx-legacy.txt

@@ -2,7 +2,7 @@ PySide6==6.4.3
 Pillow>=11.3.0
 psutil>=7.2.2
 requests>=2.34.2
-python-slugify>=9.0.0
+python-slugify>=8.0.4
 packaging>=26.2
 mozjpeg-lossless-optimization>=1.2.0
 natsort>=8.4.0

requirements-win7.txt

@@ -2,7 +2,7 @@ PySide6==6.1.3
 Pillow>=9
 psutil>=7.2.2
 requests>=2.32.4
-python-slugify>=9.0.0
+python-slugify>=8.0.4
 packaging>=26.2
 mozjpeg-lossless-optimization>=1.2.0
 natsort>=8.4.0

requirements.txt

@@ -2,7 +2,7 @@ PySide6<6.10
 Pillow>=11.3.0
 psutil>=7.2.2
 requests>=2.34.2
-python-slugify>=9.0.0,<10.0.0
+python-slugify>=8.0.4,<9.0.0
 packaging>=26.2
 mozjpeg-lossless-optimization>=1.2.0
 natsort>=8.4.0

setup.py

@@ -152,7 +152,7 @@ setuptools.setup(
         'Pillow>=9.3.0',
         'psutil>=5.9.5',
         'requests>=2.31.0',
-        'python-slugify>=1.2.1,<10.0.0',
+        'python-slugify>=1.2.1,<9.0.0',
         'mozjpeg-lossless-optimization>=1.2.0',
         'natsort>=8.4.0',
         'numpy>=1.22.4',