How can I use old maps with new sygic version 16.4.12

I am currently using sygic 16.4.12 on my Nexus 5x phone. Pakistan map which is downloaded which this version is pak.os.2015.10
But, I want to use the old maps i.e pak.tr.2015.06 (which came with sygic 15.4.10) as these are more detailed than the new one. I have copied the maps in maps folder but sygic is not detecting it. Is there anything which I need to change to make sygic detect old version of maps?

Thanks.