First you need to make sure your OFW is 3.55 or lower then upgrade to either Rebug 4.41.2 or Rogero 4.41 both are fine.
Now about downloading games, before you do that you need to get an external HDD
WD Elements or My Passport if you have PS3 FAT(the old model)
Use any partition program like SwissKnife or EAUSUS to format your External HDD from NTFS to FAT32
Then create a folder in the root of the HDD & rename it to GAMES or GAMEZ
Now download game backups from any website or any host you prefer.
Have a nice day.