My post yesterday was blunt; you really do need to stay well away from anything like this. Let me explain what's really happening here.
"Offers" like this are an attempt to take advantage of a common desire to save a few pounds/dollars by offering a seeming bargain for something desirable. The reality is that they are just about finding a way to have you install malware onto your computer.
The malware will get up to all sorts of things on your computer, but the one thing it will not do is make itself obvious to you. It's goal is to remain hidden for as long as possible so that it can be used either as a remote control system from which to launch other attacks and/or to obtain details of your accounts and password information and to then sell that information onto other criminals who will make use of to obtain goods, services or clone your identity for other illegal activities.
In some rare cases, you may even find that the desirable software actually works too. This is so that you also help market this to your friends and acquittances, helping to widen the reach of the malware and the profit for the criminals behind it. The real software publishers, such as Adobe, have a very good track record of closing these things down very quickly.
These "offers" are simple social engineering which, if you are caught by, can be very painful and difficult to put right. For example, in the UK in the last month there have been two national news items covering people that have lost their houses through the use of fraudulent identities stollen using methods similar to those outlined above. It's clear that other faulty systems made it possible for these stollen identities to be used here, but all types of systems are potentially open to this type of abuse; this is not just a UK issue. These are the reported cases and through huge amounts of hard work these people will get their property back, but there will also be other cases where the outcomes are not so good.
There's a very simple way to spot these - if it sounds too good to be true, it is too good to be true.
BBC article: Arrest after Luton clergyman reports his home stolen
BBC Article: Property fraud: 'My fake sister tried to steal my home’