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by brianvaughn 3007 days ago
Upgrading any project after 3 years of inactivity would be difficult, regardless of framework.

I did not mean to imply that you would need to step through every minor version though. I was just saying that- if you were using e.g. 15, update to the latest 15 release (15.6.2) and fixing warnings in it before updating to 16.