I was happily using Manager yesterday, but just tried to open the app and get the following error: 'This app can’t open on this PC. To find a version for your PC, check with the software publisher. I am using the desktop version, don’t want to download the app again as I foolishly did not do a back up yesterday. Any ideas?
What OS are you running on your laptop?
Feel free to re-download, as the information isn’t stored in the application itself.
I am using windows 10
Okay, then download the latest version from here: Download | Manager
And if you still have the same error after reinstalling, please post a screenshot of the error dialog.
Thank you. Have downloaded and am really pleased to say am back up and running with all the latest information. I thought I would have to install the back up but extremely pleased to know that the information isn’t held within the application itself - so relieved. Thank you for responding to my distress call so quickly.
No problem, glad to hear it’s working 
You should read about backups here to spare yourself future anxiety. Other things will probably also make more sense.