At the top of the page for CertSage 1.2.0, there is a link to the page for CertSage 1.3.0. Upgrading is usually as simple as downloading the new certsage.txt to replace your existing certsage.php copy/copies. If you've modified certsage.php (e.g. changing the location where $dataDirectory points), you will need to make that modification in the new certsage.php copy/copies. Your existing account key(s) and other data files in the data directory will automatically be used by the new version. I will (hopefully very soon) be releasing a couple of minor tweaks to version 1.3.0 that further simplify the usage of CertSage. 
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