The trex model was made in blender 2.9 and painted in substance painter , when subdivided the model have 50000 verts and when not is 14602 ,it comes with a game intended fbx of 4 LODS
LOD0=14602 ,LOD1=7772, LOD2=4012, and LOD3=1223.
the model was uv unwreapped manually and it have two maps one for the rex body and other for tongue,teeth and eyes , it comes with 4k,2k,1k textures for the trex body and for the OthersTxtures, it comes with Diffuse,Normal,Roughness,AmbientOclussion,and Emissive (just for the Eyes) Maps.
It comes with fbx,obj,stl(hp model) , a blend file and 2 substance painter files so you can edit it to your likely.
The blend file comes with a multiresolution modifier for the trex of 3 subdivisions,and with a Control Rig ,i also used a addon called Wiggle Bones for the bones in the neck,tail and leg,is used to make that effect of physics to the bones, they are not that really necessary if you want to animate and you can also delete them if you dont want to use the addon, i still did a tutorial on how to use addon,and a guide on how to use the rig,also a timelapse of the walk1anim so i can give you tips on how to use the rig, more details on the video above ,anyways thats it ,hope you like it!
(the blend file dont come with plants or trees , those are model downloaded from other sites , credits to their respective creators)
Already tested in ue4 and unity and the animations works fine , with that said if you have compatibility issues when importing animations to other softwares like cinema4d , leave it at the comments so i can fix it.