However, I have created scripts that automatically download the OFX files every night and put them in a Dropbox folder.
I tried using Apache to share this folder over HTTP so that I could trick iCompta into enabling the "Download transactions" button for each account, but it seems there is more to it than I expected.

Please consider this a feature-request to either:
1. Set a file for iCompta to periodically check for updates for each account.
2. Allow direct-links to OFX files for the "Server" in OFX Direct Download configuration.
Thanks in advance for any consideration!