Comment by srijs

From the official update:

$ shasum -a 256 atom-mac.zip 4614ec62feaea32392ad7f6b3a80534c8ad0c758ed210cabafcc86c5c49a49a1 atom-mac.zip

$ md5sum atom-mac.zip 5454bd3a8271c93f5225cd2b57cdab81 atom-mac.zip