[ddouglass]

4.02's file conversion is to convert HDzip type KMA files to HDMP3 (unzipped). Hoster 4.02 and beyond will not play Zip files. When you import them they will be automatically unzipped and added as HDMP3 type. The reason you didn't have any problem in 4.01 is because it did not have this. The decision made was to eliminate Zip files from Hoster because they are continually causing problems and will cause more in the future as they add cross-fading and other items.

Did you let the conversion run or did you stop it?
What type of file is listed to the far right on the playlist? (HD???)

Yes you should be able to install 4.01 back over 4.02. Try the ones existing in the folder and if they don't work delete all the files in the songs folder and copy in your back-up of them.