In Opera, downloaded SWF files can be accessed in two simple ways –
Type opera:cache in the address bar.
Go to Tools – Advanced – Cache from the toolbar.
Either way, a huge list of downloaded page elements opens up with their URLs. Search for a file with the .swf extension. Alternatively, you could search (Ctrl+F ) and hunt it down, with swf as the search query.
Right-click on the particular file and choose either Saved Linked Content As or Save to Download Folder to save the SWF file on the hard disk.