before i decide to download this software i want to find out how much it is going to cost me seeing i am a pensioner
you don't "download" Microsoft Azure. Microsoft Azure is a service from Microsoft. it allows you to use the infrastructure in the data center of Microsoft, so that you'll be able to create for example a virtual computer or a software without having any server or infrastructure on your company.
it does however cost you something. The cost depends on how intensive you use the service and what kind of service you use.
you can predict the cost of the service with this calculator: https://azure.microsoft.com/en-us/pricing/calculator/
Then again, the actual price which you need to pay every month may differ, because we need to look every month, who much resource you actually used for the last 30 days.