Thanks Dimar0n,
Had a good run while it lasted! 

To everyone else, the medicine still works on 12.3.8. Just install that version over the newer version. It will install. Then apply the medicine as usual. As soon as you run the app, it will download the latest update, but it will not install it until the app is closed. So just don't close the app till your work is done. This is how I retreived my data from the app. Hope this helps.

Getting really desperate at this point 
Any updates?

Hi Dimar0n.

Thank you for continually updating this app. Version 10.16.4 works perfectly as of 22/06/2024, even with the old patch (I see patch has been updated). Hats off to your dedication.

I have 2 requests:
1) Is there any way to disable updates on this app, so that we don't need to keep applying the patch time and again? 
2) Can you please patch a similar app called mybillbook (GST Billing Software Free Download | Best GST Invoicing Software in India for PC & Mobile (mybillbook.in)) If this is not the right place to request it, I am sorry, kindly point me to the right place. I will make the request there.