Hi Nake,
The choice is yours when it comes to deleting all old robots and installing new.
One strategy would be to remove all old robots and install the new ones. Another strategy would be to keep the top performing robot and just install the top 2 new robots. And, another would be to keep the top 2 robots and install just the top 1 new robot. A final strategy would be to replace all robots with new ones.
So which strategy is best? You could open 4 demo accounts and test each strategy to determine strategy that works best for you.
As a new trader you might just remove all the old robots and replace with the new ones.
Alan,