If your wallet stops(out of memory, etc.) syncing block data after header syncing, try block data below.
https://github.com/conan-equal-newone/yenten/releases/tag/2.0.1_block_data
BACKUP YOUR WALLET AND ANY FILES before updating from 1.3.1. (for any trouble)
based on bitcoin 0.15.x
see
https://github.com/bitcoin/bitcoin/commits/0.15
macOS GUI included.
To update from 1.3.1 may need long time.
You can not use old minerd.