It's sad this hasn't been updated. It had loads of potential but frustrations around lack of password manager integration etc. meant that I haven't stuck with it. I wouldn't normally suggest an alternative but given this project seems not to be progressing any further I don't think it is unreasonable, especially given I paid for the premium version. If he comes back online and starts developing it again, he's welcome to delete this
The best option I have found is a Chrome plugin called https://chrome.google.com/webstore/detail/multi-layout-manager/ijpiffheldgmdkbaohoilabdnmeinand - you can save your layouts (which includes multiple window layouts and all the tabs included within them) and give them names. You can have multiple Chrome windows and tabs open and it will reopen your exact setup in addition to everything you have open. Like Freeter but with all the normal Chrome stuff.
Hope that helps in the interim! There are other similar options I think.