Loading essential plugins and Theme files

We purchased Perth Pro, we cannot upload Custom Form plugin. As well we are unable to load Perth-portfolio, PErth-settings, perth-demo.

When attempting to load the Perth-settigns here is what we get:
“This does not appear to be a WXR file, missing/invalid WXR version number”

Can you help us with this? We really wish to use your theme however cannot load the demo and do much of what we desire to. If that is the case we might as well stay with the free version.

Hello there,

Did you import the correct file as per mentioned in this documentation?

aThemes Support