To solve this issue please reinstall you Forex Tester into another folder, like C:\ForexTesterNew

You can also add currency pairs one-by-one with help of “Add” button in Data Center.

To add new currency pair into currency pairs list please do following steps:

1)      Open Data Center 

2)      Click on “Add” button in left bottom corner of this window

3)      In appeared window please set currency pair which you want to add (for example, EURAUD). Press “OK” button

4)      In Data Center choose this currency and download data for this currency