Last week - WIN 10 upgrade.
Today 8/25 - OceanLog 2.4.4 opened successfully, but would not download dives.
Checked OceanLog update and found OceanLog 2.4.6 available.
Download 28 meg file and ran update.
Downloaded weekend dives; however, past dives are no longer on OceanLog.
I suspect that the history still exists somewhere and just needs to be merged, but really don't know.
Will work on this tomorrow, but my current advice is:
Make copy of current log before updating OceanLog.
Today 8/26 - OceanLog 2.4.6 opened successfully. However, this time, it opened the old log book (good news - I didn't lose my old data logs) but the weekend dives that I loaded yesterday now were not in there. I tried to download new dives and got a message that OceanLog would have to update something before it could download anything else. I clicked OK, it updated and then told me to restart my computer. After restarting, everything seemed to be normal. The log worked. The download worked. Seems OK now.
Overall, a bit of a pain, but a little fiddling and everything seems to be OK.
Good luck with your WIN 10 upgrade.