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There is a way to make them work on older CSP versions, but it takes a little leg work and unfortunately the data file can't be encrypted. I have to say up front that I am not a car modding guy so I have no idea if what I say here is actually factual and\or whether the car will drive the way it is intended if you do this. Also, I imagine what you have to do for each car may be different.Unfortunately for folks like us who prefer an older version of CSP, they require a newer version. Don't know if there's any way to make them compatible with v0.1.80 preview 1, which also happens to be the version I'm using...
For this example, I will explain what I did for the recently released gadu_alfa_romeo_tz2 mod. A car I couldn't use before I did this, but now at least drives. Whether it drives the way the modder intended, I have no idea since I never had a chance to drive it before doing this.
1.) Make a copy of the data.acd file (just to be safe) and then unpack the data file for the car using CM's manage car menu.
2.) Go into the newly created data folder and open up the car.ini file. At the top you will see two entries:
[HEADER]
VERSION=extended-2
[_EXTENSION]
REQUIRED_VERSION=2744
RAIN_DEV=1
3.) Delete the entire EXTENSION section. This will eliminate the CSP crash that tells you that you need a newer CSP version, but the car still won't move so you also have to edit the HEADER section.
4.) For the HEADER part, i'm a little unsure of what to do here exactly. I changed the VERSION= part to both VERSION=1 and VERSION=2 and the car worked both ways. I didn't notice any difference in the way it drove so I'm not sure which is the right way to set it.
5.) Save the car.ini file. At this point you can do one of two things. Delete the existing data.acd file and the game will use the data folder files to manage the car. Or go back into CM and re-pack the data file and then delete the data folder.
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