Guys, there is a fix at the BUDE, it's name is 'Volvo P1800 Bude-download classes fix' and it worked.
At least is the name I have in my download file.
Can you add a link please Paulo?
The car is linked to the Lotus Elite so you need that car "on". But if you tick all classes it should show for selection.
I presume that the car was released without the GTC65 class being added to the .CAR file. Every version of the Volvo has it's own .CAR file so you must do them all, not just the car you want to drive.
You can edit the .CAR file by using Notepad. This is the part of the .CAR file that needs tweaking,
classes="SIM_FULL, SIM_GTC, SIM_ABB_Server3, SIM_P1800, SIM_ELI, SIM_GTCTC65, SIM_NIGHT, SIM_NOLONG, SIM_ABB_GTC65
, SIM_GTC65"
Add the red bit and you should be good to go. Don't omit the comma
You may have to buy the cars again.