I am trying to download Bitcoin Core, but I keep running into the problem: "Unable to replay blocks. You will need to rebuild the database using reindex chainstate." What is likely the problem?
Check all the drives of the device you want to download to see if there are any files that have been downloaded previously. If there are any files, clear them all. Next, check if there is enough space on your drive. If there is not enough space, free up enough space.
This message suggests you to start bitcoin core with --reindex-chainstate command line arg. E.g.: in your command line: bitcoin-qt --reindex-chainstate
Follow this and try again later after saving all the data, hopefully the problem has been resolved. If you want, you can choose the store entire block, but if you don't want to store the entire block, you can punk the settings and select the storage as per your convenience.