Hi
I recieve ab apk file of thunkable app. Downloaded but unable to open. Size of file is ard 40+ MB. What could be the problm?
Hey @ftsmsiaw2020leouog welcome to the community! 
Are you installing it on a phone or tablet?
We have a full guide in our docs:
https://docs.thunkable.com/download#download-and-install-android-app
Do you see any error message when trying to install?
Thanks.