, unfortunately bitcoin is the only payment acceptable for software purchase. I can help you with the process. Here is a list of bitcoin exchanges to buy the bitcoins. Some accept credit cards while others only accept wire transfers - https://redrhinofx.com/buy-bitcoin/
You can also use LocalBitcoins.com and depending in your country there will be specific payment methods to purchase online or in person. More information is provided in the link above. Some countries are easier than others but bitcoin is acceptable payments in every country.
How to use Bitcoin
Get Bitcoin wallet for your cellphone ( google apps ) or for your PC ( Electrum ) or online ( Blochchain.info )
Buy Bitcoin and send it directly to your wallet.
Follow your transaction with online public ledger
Send Bitcoin from your wallet to a new wallet ( Merchant, Friend, Non Profit Orginization, ChangeTips, etc ).
Your bitcoin wallet is just like a bank account where you can deposit and withdrawal at anytime without Third party involvement.