How can I use the OSQA theme on Askbot?

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I think that at this moment there are several differents between askbot and OSQA template , so is probably that the OSQA theme is not compatible with askbot.

Even so, You can create a new theme based on default askbot theme, please check the documentation about skins.

The easiest way could be create an extra.css file and overwrite the actual css. If you would like to create a new subtheme could be usefull if you work editing the style.less file and adding the templates that you would like to override. You will need to put attention in which templates have been overwrote (if you needed) because there are some templates that has some logic that can change in future version of askbot.