diff --git a/Installation.md b/Installation.md
index 2b3230e..228c708 100644
--- a/Installation.md
+++ b/Installation.md
@@ -35,7 +35,11 @@ try using `Windows 8` compatibility mode.
 #### MacOS installation    
 ##### x86_64 version
 see: KindleComicConverter_osx_*.dmg in **https://github.com/ciromattia/kcc/releases**   
-If you can't open the last beta and the OS says it's damaged, fix it with:
+If you can't open the last beta and the OS says it's damaged, fix it with:  
+- right click on kcc icon -> click `open` -> click `open on popup`  
+- or use `spctl --master-disable`. To re-enable it you just change it to this: `sudo spctl --master-enable`
+
+to disable the quarantine popup:
 ```
 xattr -d com.apple.quarantine /Applications/Kindle\ Comic\ Converter.app
 xattr -d com.apple.quarantine -- /Applications/Kindle\ Comic\ Converter.app/Contents/Resources/7z