There are several situations. Maybe the network is not good when downloading, so take the equipment to a better place and look for it later; Either your device is out of memory, just delete a few books; There is a free version of Dream of Red Mansions. If you search for a dream of red mansions in the search bar on the home page, you will find your download record. If you order Buy and buy a free version, you can cancel the order for the original version, if you haven't read it after buying it.

Or you don't have to worry about this anymore, just buy a free book. The first book in the shop is Dream of Red Mansions.