Updating latest release of PortableApps (16.0.?)

I have updated Portable Apps program itself on many occasions. This mornint when I tried to update, I got an error:

Error opening file for writing:
E:\Portable Apps\PortableApps\ortableApps.com\PortableAppsPlatform.exe

This was after it deleted a number of files on its way to updating. I pressed Abort and then I could not run PortableApps at all. It failed with an error:
Cannot open file 'E:\Portable Apps\PortableApps\PortableApps.com\App\Graphics\Chrome\matte.png'. The system cannot find the path specified.

I copied the App and Other directories from a backup and then could restart Portable Apps. The next time I started PA, it gave the same error as at the beginning when I started it up and updated the program. This time I clicked Ignore and it seemed to work alright.

Any thoughts on what I might be doing wrong and is there anything I should/could do that would check that I have everything installed correctly again?

Thanks for a great product.

David