Migration GMapFP free Joomla 3 to Jomla 4

Hi,
Just to know, what is the proces for migration GMapFP free from Joomla 3 to Joomla 4
I cannot install/upgrade gmapfp_J4_9F in Joomla 3 website (Error message Duplicate entry '0' for key 'idx_access')
If I uninstall first Joomla 3 version, i loose database table

a kind of process below is the good process ?

• I need to export Gmap_FP tables first from database
• uninstall Gmap_FP in Joomla 3 website
• migrate to Joomla 4
• Install gmapfp_J4_9F
• and import in Joomla 4 database old Gmap_FP Joomla 3 tables

Thanks for your support