The available converter in downloads for XMB 1.9.11 to SMF 2.0.19 (https://download.simplemachines.org/index.php?converters;id=5) stops at step 1 with this error
Converting members... Successful.
Converting categories... Successful.
Converting boards... Successful.
Converting topics... Successful.
Converting posts (this may take some time)...Wrong value type sent to the database. Integer expected. (id_member)
Members, Topics are converted properly
But XMB has 24 boards (forums), while converted SMF has 18 !
XMB has 25000+ posts while converted SMF has 5600 only