Problem with installing any theme

[AOR]

Are you trying to export the theme and then re install?

Yes, I'm trying to export the theme and import it on a different server.

Silly question:

Are you selecting yes to both the questions prior to export?

Yes, I do.

If you select yes to the first question, you do not get all the theme.  See below text.

Include customized items only?

If you wish to include items (css and stylesheets) inherited from parent themes select "no", otherwise only customized elements will be exported.

[Synx]

It turned out the theme was using PHP in it, which caused the issue.