Dear Sir,
We read your description that you need to fix the old version issue that occurs and we can fix that if you provide WP-admin and FTP access details and we can start the work immediately. We can also update and migrate after words.
We offer an hourly basis of working at the rate of USD7/hour. So, whatever final total fair hours it will take will be your payable project milestone at the given rate.
We have established company since 2003 and has 16+ years of working experience doing - Website Design, Responsive, HTML5/CSS3, Bootstrap, Wordpress, Woocommerce, Database, Core PHP/MySQL, Mobile Apps, etc.
Best regards,
- Nirali
WeTheDevelopers