Program modifications in C#

There is software for performing actions on Behance in Chromium: like, comment, subscribe.
Of all actions, only the like is necessary, so there is no need to fix comments and subscriptions.

The essence of regular software updates is related to periodic changes in the layout on the Behance website, so the software does not see the necessary classes in html and stops the process. In the attached files, you can see an example of changing the class for login (code in the software and updated html on the site).

List of actions in the software:

1. Opens the site Behance.net
2. Navigates to the login page
3. Takes the login and password from the account and logs in.
4. Goes to each link I specify in the software and likes.
5. After completion, clears cookies and repeats the login process with other accounts.

I haven't used this software for over a year, now there is a need, but the author of the software cannot work at the moment due to certain circumstances. Usually, such fixes cost me $10-15, as they didn't take much time, but now I am setting the price three times higher because I understand that you will need to study the source code.