Hello, indeed, I felt the same way when I saw Espionage 3 for the first time, but after using it (and supporting it) I realized that the design decisions were not that bad as they appear at first.
In Espionage 3 you to decide on your own which folders you want to protect, and for some users this might be a difficult task as not everybody knows where does the application keep its data, but you can always ask me

On top, the protected folders will not lock once you quit the application, which appears as a security issue, but this is feature is important only in one case: you leaving the Mac unattended without a password protected screen saver AND with the protected application NOT running, yes, indeed, in this, but only this case, Espionage 2 will protect you better then 3. However, normally, it is very probably that the protected application will be launched, so in this case Espionage 2 will not protect you either. And you should not leave the Mac unlocked, if you feel you have sensitive data on it.
On the other hand, Espionage 3 is much simpler in design it has less complex process correlation and therefore it is less prone to problems. Also, it is Espionage which creates the folder passwords for you, which are far stronger then you would ever create and it does not make you remember password for each folder, just one, and this is to open Espionage. If you set Espionage to launch at login and the folders to unlock at login, then all the data will be protected on your disk in case someone steals the Mac.
But now I will stop preaching, this all is just my personal opinion.
To your questions, all is possible:
1-I've paid for a lifetime upgrade key.. is there any possibility to install Espionage 2 instead and use the same key?
2-If not, can i get refunded and then buy Espionage 2 ?
3-Would there be any problems uninstalling espionage 3 and replace it with espionage 2?
4-I need a link to download Espionage 2..
We will gladly refund you your purchase if your are not a happy user, considering you paid for lifetime upgrade option, you actuall do own an Espionage 2 key too, we just need to generate if for you, uninstallation of espionage 3 is quite simple, just delete the application, and the espionage 2 you can download from
www.taoeffect.comLet me know your comments,
Rgds
Zsolt