What follows are directions for upgrading from specific versions.
Option clock_check, previously found in the [VantagePro] section, is now found in the [Station] section. The install program will put a default value in the new place, but it will not delete nor move your old value over. If you have changed this value or if you can't stand the thought of clock_check appearing in two different places, you should delete the old one found under [VantagePro] and make sure the new value, found under [Station] is correct.