diff --git a/Installation.md b/Installation.md
index d1f12ce..66cd39e 100644
--- a/Installation.md
+++ b/Installation.md
@@ -11,6 +11,7 @@ see: KindleComicConverter_osx_*.dmg in **https://github.com/ciromattia/kcc/relea
 If you can't open the last beta and the OS says it's damaged, fix it with:
 ```
 xattr -d com.apple.quarantine /Applications/Kindle\ Comic\ Converter.app
+xattr -d com.apple.quarantine -- /Applications/Kindle\ Comic\ Converter.app/Contents/Resources/7z
 ```
 
 ##### M1/M2 arm64 version