1) In the download center for PowerStore, see the known Issues section for the "PowerStore 4: Support Fix - Pagination issues when PowerStore is installed in the site root "
2) In the webassist/plugins/catalog/featuredbox.php page, you can change the case of the link for the image, i am looking in my PS4 and 4.01 files and the link is the correct case, if you cannot fild the link, send a copy of your file so i can look at the code.
3) you need to center the things when creating the flash file. I have downloaded the flash movie for from that page, and the image is not centered in the movie itself. Also there appears to be some blank frames at the end which cause it to appear not to loop.
4) The update to PS4 from PS3 will not remove the ps3 tables, only convert them to ps4 allowing you to maintain the ps3 shop at the same time.