Does RTC 4.0.2 work with RDi 9?
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The list of system requirements calls out most supported integrations. Here is the list for RTC 4.0.1 and 4.0.2 which I got from following the link from the RTC 4.0.3 (current release) product page. So there may not be a difference. I'll poke someone to verify that.
You cannot use a 4.0.3 client with a 4.0.2 server (we support older clients with newer servers, but not the other way). So if you have to bump your client, you'll have to bump your server.