Assetto time trial server is running GT3s at Spa for a little longer if you want to set some times. I'll be changing the config early next week.
DLC is below if you need it, let me know if you run into any issues.
server: vrg time trial
pass: tfwnodriftfu
DLC: https://mega.nz/folder/BBwxhS6D#4jJIfs6omnJUaJfsnqPqGQ
leaderboard: http://198.23.223.127:50041/lapstat