The 70D requires ACR 8.2 that is only compatible with PSE 12 and newer. Basically the camera is newer than when PSE10 was the current version of PSE and Adobe only updates whatever the current versions of their software are for new cameras.
You can use the DNG Converter 8.2 or newer (currently it’s 9.1) to create DNGs from the CR2 files one FOLDER at a time. When you are selecting the source location keep in mind it is a folder and you should be single-click-selecting the foldername not double-click-opening the folder.
The DNG Converter can be downloaded from the Adobe Updates page:
Thank you for the info. I thought since I was updating from the Adobe page for my version of PSE and clicked on the supported cameras, I saw my Canon 70D in the list therefore it made me think I was on the right track. I have the DNG converter and have selected the entire folder, not just single images. I will try again with that making sure I am doing it right.
UPDATE: Your information helped me by eventually leading me on the correct track. I found out I didn't have the correct DNG converter for Windows Home Vista Service Pack II and once I was able to install it, I used your tip about selecting the entire folder (by creating a separate folder of just RAW files) and was able to reach conversion success that way. Now my files are there for me to edit with my PSE10. I avoided an expensive update of software by going this route. Thank you!