It is a pack of data main of J League as ever. Because the base is last year, the basics are the same as the FM2018.
There are several versions available, but please download the basic version according to the database version you want to play. If you are not sure, please use only v2.0.x. v2.0.x is designed for FM 19.3 (a database version of FM, a major update that reflects the winter transfer market). As future update is only v2.0.x, please use this as a basis. By the way, v2.0.x is data of season 2019.
In addition, v1.0.1 is the data of season 2018 that was diverted as it is in the J2 League pack of FM2018. In addition, v1.9.0 is data (up to 3/1 update) created for season 2019 before FM19.3 is released. Both are only applicable to FM 19.0 (launch database version).
Although it is possible to play in the J-League configuration included in the package, you may not be well adjusted because you are not good at advanced rules. Therefore, if there is another J League configuration, please use it.
Please refer to here for the full-fledged J League configuration (but it seems that only FM19.0 at the moment), player data can be used by downloading from the following. (However, since this is a product made by another person, we can not know the integrity or anything here. And since it is probably not supported during production, please be careful when using the data during production. By the way, it should be noted. The Roman version is produced on the blog, so if you want Roman letters, please look for the link above.