Hi @Devika_Raj ,
If you check the BOLD website, it seems that the 2015 release is still the most current release package:
https://v3.boldsystems.org/index.php/datarelease
You could use the BOLD API to download more recent data, but to answer question:
Yes indeed you would miss newer records, but how much difference would it make? Has the taxonomy of your clade of interest changed that much since 2015? These are questions that I cannot answer — you will need to decide based on the biological question and clades of interest.
As an alternative, you could pull all current records of COI genes from NCBI (which I believe contains many of the same records present in BOLD)... see this tutorial: