Never! Never get anything from CIR it really is not quality, not quality use of your $$$
The eatc mod isn't bad, I personally haven't tested the 2021 edition which is latest so I have no idea if they've improved any physics etc, but by far the best TCR mod is the Tommy78, he's working on the 2019 wtcr version currently. I've already emailed him regarding a "homologation DLC" pack, which would contain the other cars currently available for use in TCR series around the world but most of those models aren't obviously partaking in that current version of 2019 mod. Problem is with the astra, even though it's a homologated car, barely anyone uses it.
Hell even the 4 cars that Kelly Racing brought downunder for 2019, are for sale currently tells you all you need to know about the popularity.
P.S. Anyone by chance happen to have the eatc 2020 files?
eatc 2020 files:
be careful, the Lada Vesta is bad.
You have to remove it to make a complete grid.
Take that of 2021.