IPA: /ˈʌpˌdeɪtə/
KK: /ˈʌpˌdeɪtər/
A person or thing that makes something more current or up to date.
The software updater automatically installs the latest features.
Updater → It is formed from "up" (meaning higher or increased) and "date" (from Latin "data", meaning given or something that is provided) and "-er" (meaning a person who). An updater is a person or thing that increases or provides new information or updates.
Think of someone who is making things 'higher' or 'better' ('up') by providing new information ('date'). An updater is someone who brings things up to date.