You cannot go backwards.
The only way to open the 2018 part or assembly files in 2016 is to save as STEP (or some other neutral format) in 2018.
@Anonymous
When you say my project, does that mean these files that got migrated are a school project and the license you have on your personal laptop is educational (free for 3years)? If so.. Having educational files located in your office or a commercial environment and also modified by commercial license may lead to your company being fined by Autodesk if they are audited. Never mix educational files with a commercial environment..
Mark Lancaster
& Autodesk Services MarketPlace Provider
Autodesk Inventor Certified Professional & not an Autodesk Employee
Likes is much appreciated if the information I have shared is helpful to you and/or others
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