For mobile trader which file should I use the zip or msi file?

There is differences between mobile processors and the MSI file locate to install the specific files for specific processors, but there is some new processors is not located in MSI file, so you have to unzip the ZIP file and test the files one by one till one of these files work well.

To install the mobile trader using the MSI file you need the .Net FrameWork to be installed at the PC, note that the Mobile trader is only installable on the Windows Mobile Based Mobile phones.

Related link:
VertexFX Mobile Trader
How can I install mobile trader on my phone?