Hi, I'm looking for solidworks-abaqus associative interface plugin for solidworks 2018

I don't think there is one.

Simulia issued a new one for 2018. Call your Abaqus support and they can send it to you. The previous version did not support the latest ASIC versions or something so it would not write out the part files for the EAF file. It seems to work well enough but be careful with length of part names and bad characters - best to rename the parts in swx (if you need to) and then invoke the SWX to Abaqus export.