Both links are fine ( tested with with firefox ). Perhaps a problem with your browser or sometimes the server is down ( the full upgrade package is near 40 Mo if it is less than 39 Mo your download was corrupted it happend often with www.handheldsources.com when the server is under heavy usage )
There is no gap beetween releases since the new firmware just overwrite the previous one and include every thing.
YOU NEED BOTH upgrade for
PC tool (
4.8d ) +
G6 Firmware 4.8 ( read rhe readme file if you don't remember the upgrade process ! )
Try to go there
http://www.handheldsources.com/Download.html and choose the latest upgrade v4.8(d) for PC App and 4.8 for the G6 firmware.
Else you can check here for alternate download site
http://www.linfoxdomain.com/nintendo/ds/ ( if javascript is enable else you can browse from
http://www.linfoxdomain.com/nintendo/ds/?jsoff )
It works with Zelda PH ( need
both upgrade from PC application and G6 firmware,
No need of any other thing like armfix... )
There was a bunch of release in July and 4.8d is the latest one. It supports more games ( including a newx scheme protection seen in recent games ) and fix a least a nasty bug so UPGRADE ! ;-)