We updated the documentation to include the required step for installing the Mendix Native Builder tool when installing in an offline context.
Please see https://docs.mendix.com/howto/general/install#offline for an updated list of steps for installing.
It does not need to install the lastest version, I think the lastest version always not the stablest one .
In general you can follow the documentation and download the dependencies as stated here https://docs.mendix.com/howto/general/install section ‘Installing Mendix Studio Pro Offline’. I know for Mendix 8.15 a new dependency was added, and that still needs to be added to the docs.
Please try downloading https://appdev-mx-cdn.s3.amazonaws.com/native-builders/latest.exe and adding it to the dependencies folder with name: mendix_native_mobile_builder.exe
I hope that helps.