Thread:Extension talk:Semantic MediaWiki/Upgrading SMW old version

Hi, My production wiki is on ver 1.15.1 and it has smw 1.0.1 installed. I am trying to test an upgrade in the dev environment which is mw 1.19.9 with smw 1.8. The extension has installed successfully and is showing up properly in special:version. But the pages using it are breaking. I was wondering about how i should go about upgrading smw to 1.8. Are the old SMW_settings and SMW_Globalsettings compatible with the latest install? Should the upgrade be done in steps? I was reading and I found that there have been several schema changes. Any help is greatly appreciated

Thanks in advance.

Arnab