I have 3 joomla sites still using J3. (These are client sites).  
The sites are alerting me in big bold that I need to update to J4, but I cannot until I have the updated version of the template.  These are still on the list to be converted and a number above them on the list that are past their expect conversion date.  I need to get this arduous J4 conversion process done which requires a staging site, and figuring out what plugins conflict.  Sure would like to get this job behind me.  Any advise?  
J51_Substance,
J51_Metropolis
J51_Calibra			
			 
					 
	 
					 
	 
	