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?