The 'www' folder contains a lot of game data (images, scripts, audio files, etc), not only the save files. If you move it from 5.2 to 8.2, you are overwriting everything new in 8.2.
To update, first unzip 8.2 again to recover the data you lost from adding 5.2 'www' to it.
Then, access your 'www' folder in version 5.2 and copy the 'save' folder that is inside into the 'www' folder of version 8.2.
This is the 'save' folder that you should copy: