Hi! I had the same error
Error in C:UsersAdministratorDesktopRO Installer ScriptRO.iss: Disk spanning must be enabled in order to create an installation larger than 2100000000 bytes in size.
I tried doing the procedure as stipulated but the following lines were shown:
Error on line 25 in C:\Users\Andrew Palma\Desktop\One RO Patcher\RO INSTALLER\RO.iss: Value of [Setup] section directive "DiskSpanning" is invalid.
I typed in this