This morning my Skype Portable 7.X stopped working. It would log me in and log me out right away telling me my version was outdated.
If I install Skype 8.X it is a different software all together and it has an option to export 7.X chat history but of course it doesn't see the portable version.
What I did was download the non-portable version of Skype 7.X from https://www.filepuma.com/download/skype_7.40.104-17037/
Installed it. Now Skype 7.X non-portable won't start either, but I did try to login just so it recognized the username and maybe created the right folders/links to data for that username.
Then I took my skype username folder from portable and put it into:
Then I installed Skype 8.X which then allowed me to use the export 7.X history which it will do for you and give you a nice browsable version in html format.
I hope this helps someone. Sad to stop using Skype Portable, but no choice at this point.
Also, I'm not 100% sure but I think now all Skype Chat history is in the cloud
*** UPDATE *** -- I was able to get Skype 7.X (non-portable) to work ... See this: https://www.reddit.com/r/skype/comments/amldf3/how_to_get_skype_version_...