There is no difficulty about this. All you needed is to get software of the statistical package and follow the steps that will be indicated once the set is lauched. It's a matter of clicking 'next' and instance.
You can install the trial version of the latest version of SPSS from IBM's website. This will last you 30 days. However, if your goal is to secure something more permanent and free, you can opt for PSPP. It has most of the features of SPSS with the same buttons. All the best.