My bookkeeping function will be transfered from my PC (Win12) to iOS. Therefore I experted the file via the backup function. Manager is newly installed on an iMac but it can’t open this .manager file. It says: Invalid file format
You don’t say what version of Manager your backup was made from. If it was from before September 2020, you may need to update in two stages due to removal of a format conversion script from later updates.