The Iron King is only the beginning. The curse spans seven books, concluding with The King Without a Kingdom . Having the next digital volumes queued up is highly recommended, as the cliffhangers are legendary.
For older published editions (like the 1956 Rupert Hart-Davis edition), you might find scans on the Internet Archive. These are often but not downloadable. The quality varies, but the "best" scans here are usually high-resolution black-and-white TIFFs converted to PDF.
When searching for the , quality varies wildly. Here is what to look for to ensure a premium reading experience: