When running Pre-Renewal, make sure to change these names (just rename or just a dash ( - ) after char, login, and map) in the rathena folder:
charserver_PRERE to char-server_PRERE
loginserver_PRERE to login-server_PRERE
mapserver_PRERE to map-server_PRERE
because when I first ran the Pre-renewal batch file (runserver_PRERE), it gave me an error stating that it couldn't find these 3 batch files so when I renamed it, it worked.
Batch file names are case sensitive when it comes to Linux apps (ex. MySQL)
This worked for me so hopefully, it works for you too.