4.2.3 is the current version number of Evolve (free version), Evolve plus is currently 126.96.36.199, far away from 4.2.3. So if you mean Evolve, then link hover color isn’t regulated in general, but depending on the location of the link. For example, if you are looking for a link hover of the menu, you go to Customize->Menu->Hover Manu color. In some cases, you would have to use CSS (we can help if needed). Evolve Plus is similar, but there you have predefined color themes which also affect the hover color. Where do you need to change the link hover color?