How to copy and install programs in HP 50G?

[anhnha]

Hi,
I am new to HP 50G and I just saw that there are lots of HP 49/50 Electrical Engineering Programs available here.

I tried to download some of them but I couldn't figure out how to make it work.
For example, I downloaded a program called "amplifier" and extracted it. All of these files come with hpe extension.
Then I copied them to SD and to home directory after that.
However, it didn't work.
Also there are some programs about resistor color code. Where should I copy these programs and make it work with HP 50G?