Grid 2.5 has not serious changes in API, so most functionality will work without any changes.

Grid 2.5 will work only with latest dhtmlxcommon.js ( if you have an error “dhtmlx” is undefined - you are using incorrect dhtmlxcommon.js )

If you are using custom paging template beware that while in older version “prevpages” and “prev” was related to the same control, in new version those are two different elements ( thirst scroll group of pages, second the active page only )

If you are using compiled file ( dhtmlx.js ), beware that version included in package is compiled with dhx_skyblue skin, so if you have used dhx_blue or dhx_black skin you need to recompile it with necessary skin, or migrate to dhx_skyblue ( it doesn't affect all grid-specific skins such as xp, modern, light )