Cannot be opened in Revit LT because it was last saved in a version prior to 8.1

[arcsurvey]

Hi, I know this has been posted a lot of times but there is no solution that I have found that works for me. 

I use Revit LT, I don't have the full version and I only work on files I create. 

If the file is created on my PC, it used to be fine if I try to open it on another PC, like my laptop. The problem started for me when I moved my files to a NAS drive (Synology).  The NAS syncs with Dropbox. I can no longer open the files on the NAS or Dropbox from a computer except the one it was created on. Before the NAS drive when I had the files on my PC it worked fine. 

I cannot open the files with the full version either. The file is not corrupt as I can still open it from the original computer it was created on from the NAS. In the past it worked when I used a newer version, eg; I open a 2018 file in 2020 but even that no longer works. This means that I cannot work on my laptop and I cannot share files with others as they cannot edit the file. 

I am away from my PC for three weeks and I cannot do any work which is causing me huge problems. I don't know what will happen when my PC needs replacing and I cannot open any files. If I download the files from Dropbox, same issue.  Opening files from Explorer doesn't work either. 

This seems to be an issue with files saved remotely. Please sort this out. 

[DarrenP]

what happens if you copy the file to local folder & not a folder thats is being used by dropbox

does it open on the other machines?

[arcsurvey]

Hi Darren, thanks for the reply. Yes, if I copy the 'corrupt' file from the NAS to the laptop it will open. It will also work through Dropbox if it is stored on the PC and opened through dropbox from the laptop. It seems to be the fact that the files now sit on an external drive. I can open files using the laptop through Dropbox from the NAS drive that were created before they were moved onto the drive, just cannot open the ones that have been created on the external drive.