Unable to convert v3 arhive files with the migration tool. (Invalid file type error)

[He Post]

Dear Session Buddy support, 

I lost all my collections after the v4 update. 

I am trying to convert my old v3 databases file under "chrome-extension_edacconmaakjimmfgnblocblbcdcpbko_0.indexeddb.leveldb" folder but the numerically named files here seems not to be supported by your v3/v4 migration tool since the migration tool gives an error message that file types are not supported.  

I will be pretty appreciated if you can guide me to convery my old database.

Regards,

Han