Finding the NSX vib can be daunting if you dont know where to find it. If you need to find the vib, here is a surefire way (as of 6.2.x).
Visit the following URL:
https://<nsxmanagerIP>/bin/vdn/nwfabric.properties
This will provide you a nice little text file showing where the different versions are located. Here is an example:
# 6.0 VDN EAM Info
VDN_VIB_PATH.1=/bin/vdn/vibs-6.4.4/6.0-11070622/vxlan.zip
VDN_VIB_VERSION.1=11070622
VDN_HOST_PRODUCT_LINE.1=embeddedEsx
VDN_HOST_VERSION.1=6.0.*
# 6.5 VDN EAM Info
VDN_VIB_PATH.2=/bin/vdn/vibs-6.4.4/6.5-11070622/vxlan.zip
VDN_VIB_VERSION.2=11070622
VDN_HOST_PRODUCT_LINE.2=embeddedEsx
VDN_HOST_VERSION.2=6.5.*
# 6.6.3+ VDN EAM Info
VDN_VIB_PATH.3=/bin/vdn/vibs-6.4.4/6.7-11070622/vxlan.zip
VDN_VIB_VERSION.3=11070622
VDN_HOST_PRODUCT_LINE.3=embeddedEsx
VDN_HOST_VERSION.3=6.6.3+
# 6.7 VDN EAM Info
VDN_VIB_PATH.4=/bin/vdn/vibs-6.4.4/6.7-11070622/vxlan.zip
VDN_VIB_VERSION.4=11070622
VDN_HOST_PRODUCT_LINE.4=embeddedEsx
VDN_HOST_VERSION.4=6.7.*
# 6.8 VDN EAM Info
VDN_VIB_PATH.5=/bin/vdn/vibs-6.4.4/6.7-11070622/vxlan.zip
VDN_VIB_VERSION.5=11070622
VDN_HOST_PRODUCT_LINE.5=embeddedEsx
VDN_HOST_VERSION.5=6.8.*
# 6.6.3+ VDN EAM Info for SDDC
VDN_VIB_PATH.6=/bin/vdn/vibs-6.4.4-sddc/6.7-11070622/vxlan.zip
VDN_VIB_VERSION.6=11070622
VDN_HOST_PRODUCT_LINE.6=embeddedEsx.sddc
VDN_HOST_VERSION.6=6.6.3+
# 6.7 VDN EAM Info for SDDC
VDN_VIB_PATH.7=/bin/vdn/vibs-6.4.4-sddc/6.7-11070622/vxlan.zip
VDN_VIB_VERSION.7=11070622
VDN_HOST_PRODUCT_LINE.7=embeddedEsx.sddc
VDN_HOST_VERSION.7=6.7.*
# 6.8 VDN EAM Info for SDDC
VDN_VIB_PATH.8=/bin/vdn/vibs-6.4.4-sddc/6.7-11070622/vxlan.zip
VDN_VIB_VERSION.8=11070622
VDN_HOST_PRODUCT_LINE.8=embeddedEsx.sddc
VDN_HOST_VERSION.8=6.8.*
# Single Version associated with all the VIBs pointed by above VDN_VIB_PATH(s)
VDN_VIB_VERSION=6.4.4.11197766
# Legacy vib location. Used by code to discover avaialble legacy vibs.
LEGACY_VDN_VIB_PATH_FS=/common/em/components/vdn/vibs/legacy/
LEGACY_VDN_VIB_PATH_WEB_ROOT=/bin/vdn/vibs/legacy/
After finding the VIB you need, simply copy the path and add it to the URL following your NSX Manager:
https://<nsxmanagerIP>/bin/vdn/vibs-6.4.4/6.7-11070622/vxlan.zip