It depends. If you overwrite the existing files in your Grandma's House directory with the files from the update patch, the rels.rpy file for the IC version will be overwritten with the rels.rpy file for the Patreon version. The patreon version is the non IC version, so that means you'll have to re-download and re-install the IC patch.Do we need to re-download the incest patch if we already installed it in .18 and are only updating to .19?