The time I had to spend on building the new features for this update was way more than I expected. As more and more features become available in the plugin, adding just one new function could affect many different parts of the code. And this could also lead to more issues.
For this update, I also had to rearrange different sections of the plugin as the number of settings that were visible on one screen became too much. I had to spend 3 extra days just on that.
New features in 1.5.0:
And here is the email I sent to the customers about the new features.