I've installed eshop plugin on my server and at appearance/eshop i received the following error: Warning! "The css file is not currently editable/writable! File permissions must first be changed". I've changed the permisions of the eshop plugin folder but same error. After a while I realized that it is possible that some files did not copy to my server because of my directory settings but I didn't received no error about this. So I installed a version of eshop on my localhost wordpress instalation and compared the folders and see that there were some files missing in the "/wp-content/uploads/eshop_files". I've just copied those files to my server and everything work's fine now. Great plugin!