See if you have a pending invoice in your client area: https://invisioncommunity.com/clientarea/
If there's none, try contacting IPS to find out what you can do based on your current license: https://invisioncommunity.com/contact-us/ (Accounts & Billing department)
Here you go also a couple of links:
Self-hosted license price/details: https://invisioncommunity.com/buy/self-hosted/
Invision Cloud: https://invisioncommunity.com/buy
With the Cloud option, you won't have access to the files, but if you provide the backup to IPS they should be able to help. Contact them to double-check how it would work, though.