Lost Invoices module in Zoho CRM

Lost Invoices module in Zoho CRM

Hi,

Our company was using Zoho CRM with Invoices module incorporated in it.
After some research we tried to implement better Zoho CRM plan. We went through the trial period, did not decided to go for it, and after reverting to previous plan we have found out that some of our modules don't exist any more. What happened and, of course, how can we get the Invoice module back in our Zoho CRM.

Regards,