Auto-upgrade forum

Hi, I used the upgrade function to upgrade from 1.6.4 to 1.6.5 and now I have 2 forum plugins on my plugins list:

forum 1.6.5
forum 1.6.4

Qn: Can I select delete forum 1.6.4 and delete it? I checked my files and realize that there is only one forum folder. So I am not sure if we are meant to have 2 forum plugins after the upgrade.

If not, then what do I do?

Thanks.