After OI bought 2 years ago. My themes seems like need update. I tried to contact the seller support but no answered. How to update my wp themes by myself? Is there any plugins or software to update my themes?
Can you explain what kind of update you want... are you looking for theme customization etc. Send your blog URL and your requirement. I am a software engineer may be I can help you out. Well there is plugin or software that can update your theme.
Generally you update a theme to keep up with new features in the Wordpress core, and for this you need some basic PHP coding knowledge. To get help, you'll need to be specific about what "updates" you want.
Updates are provided by the author of the theme. If you want to improve it but you cannot expect any help from the person who made it, you can download a template like Twenty Ten (created by the WP team), compare it with your current theme and add features that are missing in yours.
There can't be plugins or software to update a theme - "plugins or software to update a theme" doesn't mean anything. Themes are updated by writing new code - by hand. Either you learn how to do it, you hire someone to do it or you use a newer theme. (About the only time you have to "update" a theme is when Wordpress is updated and the theme will no longer work with it.)