Can't install TOPO US 24K Southwest v3 Maps on GPSmap 60CSx

Hello, I've been searching and working on this problem for several days. I have 60CSx I purchased in 2010. I also had a set of US 24K Southwest Maps on CD I purchased in 2010. I updated my Laptop to Windows 10 and that's where it all went wrong.

I took me a while to get BaseCamp 4.6.2 installed but I succeeded. Of course I then tried to install my TOPO maps from 2010 and it gets to about 57% and then just stalls.

I purchased new TOPO US 24K Southwest v3 that are on a micro SD card but as yet have not been able to install them on my 60CSx or my PC. I did drop the map file onto the SD data card I had in the 60CSx and it replaced the one in there from 2010 :(but now I my 60 CSx shows no maps at all. I'm really going downhill with this right now.

Any help would be greatly appreciated :(

Thanks!

Mike

EDIT: I have managed through some miracle to get the v2 of TOPO Maps installed back on my PC by having Windows fix compatibility issues with the software. I'm now installing (Hopefully) the maps back on to my GPS. I'll know after 4 hours or so of install time if it works.

My next task will be to get the v3 of the TOPO maps installed on to my PC. Not sure how to do this since it's basically an image file and no installer software.