If the receiver is not working, then you should send it to a repair shop.
What makes you think that you need to change the software ?
I will help you to download the software, just follow the procedure below:
Click on this link
http://www.google.com
In the text box type the following text:
Technosat T1020 Classic Software
In the results page you will see several results.
Click on the line that says:
Satellite Receiver Software
In the page that opens, find the text
T-1020 Classic and then download the zip file
Unzip the file in a subfolder and this would be the software for your receiver.
If you haven't done any software upgrading yourself, then ask the help of a friend or someone professional who does.
You will probably need an RS-232 crossed cable. Look at the back of the receiver and it should have a 9-pin male D-Type connector.
Good Luck