Log into you IK account, or better, go through the IK Authorization Manager that should be installed on your computer. If you don't have it, you'll need to download it from IK.
You should have plenty of authorizations left. I still have 8 for X-Gear.
X1 Essential and its plug-ins are 32 bit, so definitely point to the x86 folder.
Is this a new computer? If so you will need a new activation.
If it is the same one you had X1 installed on, you activation code should be...active.