Typically this would involve an upfront non refundable deposit paid to the investor plus a rental agreement of some duration (1-2 years) . At the end of the rental period you would need to qualify for a regular mortgage or continue to rent. You run the risk of losing yoru deposit if you cant qualify for a mortgage.
Or the investor might agree to provide you the mortgage at a higher interest rate.
In the long run, your best situation is to rebuild yoru credit, save for a downpayment and qualify for an FHA loan
You probably should adjust your housing target to eliminate distressed sales and include regular ones.
Doesn;'t heard to give them a call.