Just updated to R52.33. Quicken update did create a backup prior to updating its program. However, when he relaunched itself and tried to open my data file it tried to validate the file, said validation was complete, and in trying to open the file stated the file was corrupted and couldn't open it.
I restored my data file from the backup Quicken took prior to it updating itself and the file opened. This was my experience with the R52.33 update. FYI.