You can currently create Corona SDK/Solar 2D apps which later download scripts and execute them using patcher:
https://github.com/roaminggamer/RG_FreeStuff/raw/master/Products/patcher/patcher.zip
Docs: Patcher
NOTE: Is is no longer necessary to use it as a plugin. Just download the code (link above) and include it in your project where ever you want it.
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