I don't know if this is of any use for you (don't know what ACR is), but I use Photoshop CS2 with my 600D, and have to convert RAW files to DNG format, Adobe have a tool for this here: http://www.adobe.com/support/downloads/detail.jsp?ftpID=5738
The DNG converter is exactly what you want. Download the CR2 files, convert to DNG, CS5 will read DNG files fine. I'm still on CS6, works fine, I don't like subscription software.
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