Unfortunately, we do not provide a direct import option from Eudora.

The best way to get your data from Eudora to eM Client safely is to first use Thunderbird to import the data into it (detailed instructions can be found in this MozillaZine article).

After all your data is safely imported in Thunderbird, go to eM Client and then use the Menu > File > Import.. > Application: Thunderbird option.