Solution compatibility between 365 and 2015

Hello,

I have build a solution using Dynamics 365 online. I who would like to install it on 2015 (version 7.0). I'm mostly using the Javascript SDK and web forms to enrich leads / accounts entities. 

According to the version compatibility table, it's not compatible out of the box:

https://msdn.microsoft.com/en-us/library/gg334576.aspx#Anchor_2

Can anyone tell me what it would take to get it to work on Dynamics 2015?

Thank you

Vincent