To update your theme to new version just add new and replace changed files.
Don't forget to clear Magento Cache after uploading new files.
Added - Magento 1.9.0.1 support
Fixed - Magento 1.8 compatibility problems
app/design/frontend/default/metroshop/layout/checkout.xml
Remove file - app/design/frontend/default/metroshop/template/checkout/onepage.phtml
Remove file - app/design/frontend/default/metroshop/template/review/form.phtml
Fixed - Bundle product price live update calculations
app\design\frontend\default\metroshop\template\bundle\catalog\product\view\type\bundle.php
Added - Twitter API 1.1 support
Added - Login/Logout links in header
js/twitter/*.*
skin/frontend/default/metroshop/css/responsive.css
app/design/frontend/default/metroshop/template/page/html/header.phtml
app/design/frontend/default/metroshop/template/page/html/head.phtml
app/design/frontend/default/metroshop/template/page/html/footer.phtml
Fixed - Share wishlist page "Message" text hide
Fixed - Contact page form fields display in Responsive
js/varien/script.js
skin/frontend/default/metroshop/css/responsive.css
Fixed - Price display for grouped, bundle, and other "super" products in Grid view
skin/frontend/default/metroshop/css/styles.css
app/design/frontend/default/metroshop/template/catalog/product/list.phtml
app/design/frontend/default/metroshop/template/catalog/product/new.phtml
app/design/frontend/default/metroshop/template/catalog/product/special.phtml
Fixed - Layout fixes
Fixed - WIshlist page layout bug
Fixed - Safari / Chrome CSS bugs with "blinkings"
app/design/frontend/default/metroshop/template/page/html/header.phtml
skin/frontend/default/metroshop/css/styles.css
Fixed - Tax display in prices
app/design/frontend/default/metroshop/template/catalog/product/new.phtml
app/design/frontend/default/metroshop/template/catalog/product/special.phtml
app/design/frontend/default/metroshop/template/catalog/product/list.phtml
Fixed - Notice on Product page
Fixed - Related products slider styles fixes on Product Page
Fixed
- Related products and Up-sell products title fixes on Product Page
Fixed
- Up-sell products display fix on Product Page
app/design/frontend/default/metroshop/template/catalog/product/view/tabs.phtml
app/design/frontend/default/metroshop/template/catalog/product/list/related.phtml
app/design/frontend/default/metroshop/template/catalog/product/list/upsell.phtml
skin/frontend/default/metroshop/css/styles.css
skin/frontend/default/metroshop/css/slider.css
Fixed - Search button clear search words when clicked
Fixed - Chrome buttons bug on product page
app/design/frontend/default/metroshop/template/page/html/header.phtml
app/design/frontend/default/metroshop/template/catalog/product/view/addtocart.phtml
Added - Custom Code (JS/CSS) theme admin panel section. You can add any JavaScript or CSS code for theme from theme admin panel.
Fixed - Encoding problems with special characters for not English languages in shortened product names
app/design/frontend/default/metroshop/template/catalog/product/list.phtml
app/design/frontend/default/metroshop/template/catalog/product/new.phtml
app/design/frontend/default/metroshop/template/catalog/product/special.phtml
app/design/frontend/default/metroshop/template/page/html/head.phtml
app/code/local/ThemeAdminPanel/ExtraConfig/etc/config.xml
app/code/local/ThemeAdminPanel/ExtraConfig/etc/system.xml
Fixed - Add To Cart button on Product Page add product twice
Fixed - CSS fixes
Fixed - Responsive display CSS fixes
skin/frontend/default/metroshop/css/responsive.css
skin/frontend/default/metroshop/css/styles.css
app/design/frontend/default/metroshop/template/catalog/product/view/addtocart.phtml
Fixed - Responsive touch on Slider and Products bug on touch devices
Fixed - CSS fixes
skin/frontend/default/metroshop/css/responsive.css
skin/frontend/default/metroshop/css/styles.css
Initial release