Modify template for joomla 1.5 to 2.5

[Theaver]

Long ago I have a website where you use the template "siteground-j15-53". A few days ago I decided to upgrade, because many things had stopped working in the wake of changing the version of php. The problem is that I note that the template does not work in joomla 2.5, which is what I installed. Is there any way more or less easy to use this template in joomla 2.5?? Thanks for your time.