Update our OpenCart from 1.4.9 to lattest version

We want to upgrade our website from 1.4.9 to version OpenCart 1.5.1.3 without loosing our database and products entry. We also want to add the following modules:- Sale Promotion modules, will offer us to have the option to do the following:- Everything you need to run a Sales Promotion for your Opencart web store. This extension comes with many advance options to run many combinations of sales promotion. Advance Sales Promotions: - $X Off for The Entire Store - X% Off for The Entire Store - Buy One Get One Free (BOGOF) - Buy Three Get Two Free - Buy X Get Y Free - Buy X Get $Z Off - Buy X Get Z% Off - Buy X Get Y with $Z Off - Buy X Get Y With Z% Off - Buy X from Selected Categories Get Y Free - Buy X from Selected Products Get Y Free - Buy X from Selected Categories/Products get Y from Selected Categories/Products Free - Buy X Get Shipping Free - Any type of combination using below options. Advance Customization Options: - Discount Type Percentage/Fixed Amount - Minimum Purchase Quantity - Minimum Total Value - Minimum Sale Quantity - Free Shipping - Works with Coupon - Customer Login to View - Starting Date- End Date - Uses per Sale - Uses per Customer - Supports Multi-Store - Purchase Category Selection - Purchase Product Selection - Sale Category Selection - Sale Product Selection And:- Promotional Tags & Product Labels Modules:- eatures: *Easy to add as many promotional labels to show at Featured,BestSeller,Category,Search,Latest and Product page at backend. *Easy promotional tag positioning, Top-Right, Top-Left, Bottom-Left and Bottom-Right *Easy control promotional tags & Product labels to show per product at admin page *Easy control over discount rate(%) to display per product at admin page *Allow easy control over promotional labels to link to different site. (Example : Link 'Call for Price' label to contact us page) *Facebook Like/Share at product page (Required SEO Enabled) *Display percentage discounted per product dynamicaly base on user input *Auto replace `Add to Cart` with `Sold Out`button & sold out tag whenever zero quantity is detected *Auto replace `Add to Cart` with `Call For Price` button and price remove when product price is set to zero *Auto calculating new price when discount rate is entered (Firefox not compatible) *Auto turn off promotional price,discount rate/icon when promotion period expired **Multi-Languages Supported *Qtags Update allow quick update price, discount rate, promotional tags, special price, promotion date over Qtags Update page