The issue seems to be with the current version(v2.0.1).
I found a workaround for this as the old versions still work fine. Follow the below instructions:
1. Head to the plugin page and select the advanced view (or simply follow this link https://wordpress.org/plugins/easy-theme-and-plugin-upgrades/advanced/)
2. This will enable you to download the older versions. Go to the bottom of the page under the title ‘Please select a specific version to download’, and select v1.0.6 and download.
3. You may add this version to your site and activate it.
4. After activating you may go ahead and update to the most recent version.
This should solve your issue.
