I'm sorry but it seems you read up on the differences between 32bit and 64 bit on the interent and decided you needed a 64bit verson. Get a grip!
If the Author of this bot deemed it appropriate/ and or needed to upgrade it to a 64bit version they would. Seeing how everyone can downgrade wow back to a 32bit version there is no need. If wow is laggy/freezing/choppy on your pc its your sodding pc that needs fixing not this program. As you said earlier you have a crappy processor, then upgrade it or make do like the many people out there who dont demand everything is changed to match their shitty CPU.