Just got another news from TechSmith, beside giving away Camtasia for free, they also give SnagIt for free too.

For novice user, process from download to installation process follow these steps :

1. Download SnagIt version 7.8.5 by clicking here

2. Get your licence key by click here

3. Install SnagIt by clicking downloaded file.

Click Next and and pick "I accept the licence agreement"
 

Fill user information and click Next
 

Click Next

I let default option, yours maybe vary

Next 

Installation in progress. 

SnagIt successfully installed. 

Ignore this message by click OK. 

Time to enter licence key. Click Help -> Enter Software Key 

You can insert your key which is already in mail inbox . 

Enter your name and the key. Press OK. 

The box will disappear, check again in "About SnagIt"  to check.

Thank you TechSmith 🙂