Hi jcl. I am informed by FXCM that they will not change an account to 1:400 if it has open trades. Therefore, I'm thinking of this plan (similar to upgrade):

1) Establish new account with 1:400
2) Install an additional Zorro with separate folders
3) Use the Download script to update Assets.dta
4) Copy Assets.dta to AssetFix.dta
5) Test to determine the new Margin setting for the original CR
6) Set Margin to 0 on the old account to just run the open trades to close
7) Trade the strategy on the new account setting Margin to the Tested value

Any problems with this plan?

EDIT: And how do I determine how much needs to remain in the old account to support the closing trades?

Thanks.