I just downloaded the new 3.3.3 apk and installed it normally with unknown install turned on. Upon opening the app, it kept crashing. I tried downloaded and install the apk multiple time and it shows the same result
-Go to downloads section of your device
-Clear all your downloads
-Go to getmangarock.com and download the app’s APK again.
-Download the app again, but make sure to disable your apk download from unknown sources
-After downloading do not click the complete download bar from the top (it usually appears after the download complete), instead, go to My Files>Downloads>Manga Rock