Hi Steven,
You can use EASY-SOFT 5.11 [pro] for your easy822-DC-TC.
When you start your project, you'll be prompt to choose the version of your easy822-DC-TC. For your easy822-DC-TC from Dec 2003 choose the older Version "<=V0.3"!
The newer (default) Version ">=V0.4" would give you a few more function blocks, which your easy822-DC-TC isn't able to deal with. That's why the download error occures, I assume.
If this doesn't solve your problem please state the exact version-no, build-no. etc. of your EASY-SOFT and easy822-DC-TC and the exact download error (number and description)
Regards
Bernhard