Did you take any logs or a screenshots?
Anyhow, probably the "Zip file signature verification" option was enabled from TWRP settings. If thats the case it will fail to verify since TWRP will look for the md5 file which is missing. But as long as it pass the sha1 verification, its a good file..
Place the ota zip to your sdcard, and follow the detailed instruction on the first page on how to boot to stock recovery
EDIT: You wont see the ota zip file in case your sdcard is adopted internal storage since the drive is encrypted. You need to transfer the ota zip to another sdcard via pc.
Hey dude! Google unleashed 2 types of Marshmallow OTA for the Android One sprout device. The first one was about 337mb which was meant for the LMY48M Lollipop build. The other one was about 444mb which was a similar OTA when LMY47O arrived in India.
The first OTA was meant to update Lollipop LMY48M build to Marshmallow. The 444mb was meant for older versions of Android such as Kitkat and LMY47O to LMY48K builds.
So basically, the 444mb is a stock rom image which will install Android 6.0 to your device regardless of what version you have
|firmware, mra58m, official, ota, stock|
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