copyfiles - required space problem

hello,

i have an ModernUI-Installer which copies some files using copyfiles. the problem is, that in the Directory-Dialog the required space is always 0.0kb. i have a folder which is copied, but the size is everytime different.

is there a way to get the size of this folder and all its files? and how can i set it in the directory-dialog?

when this is not possible, how can i remove the required space line?

thanks for your help.

best regards,
elDani

thank you very much!!