Upgrade Model from 8.1

[13lemartinez]

I am trying to open a file that i created on my other computer, but it wont upgrade.  I have checked for any updates on both computers, but none come up.

Please help!

[barthbradley]

I've never experienced it personally, but it has been addressed in numerous threads over the years.  Search the Forum. You'll get plenty of hits, I'm sure.   

[ToanDN]

Update your Revit LT in both computers to the same Build. 

[13lemartinez]

what do you mean by "same build"

[barthbradley]

https://knowledge.autodesk.com/support/revit/learn-explore/caas/sfdcarticles/sfdcarticles/How-to-tie...

[ToanDN]

Just install the latest Revit update for all of your computers.