How can I renew my license to Ermapper and install on a new laptop?
The ERDAS ER Mapper 2013 doesn't appear to be available anymore, which means that you'll have to get in touch with the support team on the developer's website to ask them about the possibility to re-acquire the license or use another product from the same category.
Here is the website with contact form: http://hexagonppm.com/contact-us
I am recommending this because no info could be found about the licensing procedure on their website or on any other website listed on Google Search where this software was mentioned, although the software can be downloaded again from this URL: http://download.hexagongeospatial.com/en/downloads/imagine/erdas-er-mapper-2013