This is how I used to do it - but double clicking is also not great and liable to give you repetitive strain injury 🙂 The best way to do it, is to open the first pdf and then - from within Acrobat - click on File / Open.   In the Open window, navigate to the correct folder and sort by the criteria you wish to open them (i.e. filename / Date modified / Type / Size / etc.). If you click on the first pdf you wish to open and then, using shift, click on the last pdf - and then hit the "open" button, Adobe will open them all in the order displayed. ... View more