If my vbulletin forum is at domain.com/forums and I want to migrate that to XenForo, I realise the forum will need to be closed before the import. So do I then delete the vbulletin files/folders and upload xenfororo then import? If so visitors will obviously not see any kind of maintenance notice while uploading/installing/importing. Is there a way round this? e.g. can I leave that vbulletin forum in place, install xenforo in a subdirectory and import and then delet the vbulletin files and move the xenforo into the correct location?