Download the latest mysql connector J for you mysql server from their website.

https://dev.mysql.com/downloads/connector/j/5.1.html
Direct link: https://dev.mysql.com/get/Downloads/Connector-J/mysql-connector-java-5.1.47.zip
Alternatively, can browse the Maven repository for the appropriate JDBC drive matching your SQL server version, if not using the latest build of it https://mvnrepository.com/artifact/mysql/mysql-connector-java
I suggest placing the mysql-connector-java-5.0.8-bin.jar file from this in the plugins/lib folder of CrushFTP and giving it the name "mysql.jar".

Then go to Preferences, stats config and set the following items:

stats_db_url: jdbc:mysql://127.0.0.1:3306/crushftp_stats
stats_db_driver: com.mysql.jdbc.Driver
stats_db_user: root
stats_db_driver_file: plugins/lib/mysql.jar

Use MySQL Workbench and make a new DB with the name "crushftp_stats" (or adjust the URL above to reference the name you choose.) Below is the schema to put in it:

CREATE TABLE META_INFO(RID DOUBLE NOT NULL PRIMARY KEY,SESSION_RID DOUBLE NOT NULL,TRANSFER_RID DOUBLE NOT NULL,ITEM_KEY VARCHAR(100) DEFAULT NULL,ITEM_VALUE VARCHAR(2000) DEFAULT NULL);

CREATE TABLE SESSIONS(RID DOUBLE NOT NULL PRIMARY KEY,SESSION VARCHAR(100) DEFAULT NULL,SERVER_GROUP VARCHAR(50) DEFAULT NULL,USER_NAME VARCHAR(100) DEFAULT NULL,START_TIME DATETIME DEFAULT NULL,END_TIME DATETIME DEFAULT NULL,SUCCESS_LOGIN VARCHAR(10) DEFAULT NULL,IP VARCHAR(50) DEFAULT NULL);

CREATE TABLE TRANSFERS(RID DOUBLE NOT NULL PRIMARY KEY,SESSION_RID DOUBLE NOT NULL,START_TIME DATETIME DEFAULT NULL,DIRECTION VARCHAR(8) DEFAULT NULL,PATH VARCHAR(255) DEFAULT NULL,FILE_NAME VARCHAR(2000) DEFAULT NULL,URL VARCHAR(2000) DEFAULT NULL,SPEED INTEGER DEFAULT NULL,TRANSFER_SIZE DOUBLE DEFAULT NULL,IGNORE_SIZE VARCHAR(1) DEFAULT NULL);

ALTER TABLE `TRANSFERS` ADD INDEX  (`SESSION_RID`,`TRANSFER_SIZE`,`DIRECTION`,`IGNORE_SIZE`,`START_TIME`);

That is it. Now the statistics data should be going to the MySQL tables, and reports will automatically run against those tables too.