This is a little complicated...
I did my annual hard drive clean up (wipe and reformat) and after reinstalling Logos4 I noticed after a few days that the latest Theological Journals that I purchased (vols. 10, 11, & 12) last year were not available. I assumed they did not download from the Logos4 server, so I did the scan command from within Logos4 to a backup of the Journal files that I had on my hard drive.
On restart Logos4 rebuilt my library, so I assumed that they were "downloaded". Today I wanted to search the latest Journals and discovered that they were not available. So I reinstalled Logos3 and re-synchronized my license file. On restart Logos4 recognized the latest Journals.
That doesn't seem right to me. I would think that the Logos4 license file would not need to be updated (synchronized from Logos3) again after a reinstall.