Install jester.yft, jester.ytd and jester_hi ytd from jester folder at x64w/dlcpacks/mpbusiness/dlc.rpf/x64/levels/gta5/vehicles/mpbusinessvehicles.rpf

Install vehicles.meta from data folder (if you don't install, car wont have dials and other small bugs) at update/update.rpf/dlc_patch/mpbusiness/common/data/levels/gta5

If you dont have any other car using same file, just replace it

If a different car using same vehicles meta, extract it and open it with notepad and search for VDT_BANSHEE the first one should be for the jester, remove the BANSHEE and write TRUCKDIGI it should look like "VDT_TRUCKDIGI"

Install Handling.meta from data folder (if you don't the car will roll over and wont be drivable) at x64w/dlcpacks/mpbusiness/dlc.rpf/common/data

If you dont have any other car using same file, just replace it

If a different car using same handling meta, extract it and open it with notepad and search for Jester. scroll down untill you see <vecCentreOfMassOffset. replace the whole line with <vecCentreOfMassOffset x="0.000000" y="-0.025000" z="-0.450000" />

done, start gta v and spawn by name jester