Upgrade from Robohelp 8.0 to Robohelp 9.0

Prior to upgrading to Robohelp 9.0, I backed up all my existing project files from Robohelp 8 to the production server and kept a copy on my local server under My Documents.

When accessing one of the 8.0 project files using Robohelp 9.0, a pop up box appeared asking if I wanted to upgrade and I selected yes.

After the upgrade occurred, the file opened in Robohelp; however, I noticed a few of my images were missing and a project folder displaying with no topics.   Very strange as to the files

were all there prior to the upgrade.  I went back into the project file under My Documents and all the data is showing but not Robohelp, why is this occurring? 

Hope I have not confused anyone, your help is greatly appreciated.

Thanks

Wendy