Just place the files from the 0.9 version in a new folder and copy the "hotscreen.save" and the hole "CUSTOM_DATA"-folder from your 0.8 folder to the new 0.9 folder. If you have any "hotscreen_profileX.save"- (X can be any number) files in your 0.8 folder, copy them too.
If it asks, if you want to replace the files, after pasting, click yes.