Extensions NOT Activating

I've installed six extensions to my FrontAccounting 2.4.18, one of which is Import Transactions 2.4.0-6. When I update all these 6 extensions it tells me "Current active extensions set has been saved", but NOWHERE have they been added for use. When I come back to activate all the 6 Active checkboxes remain unticked. Please, can somebody advise me how to get these extensions active and working, especially the Import Transactions extension.