Your post is not complete. You did not read the pinned topic before posting. You need to read that and fill out the information in this thread accordingly
I am aware that Skype is listed on Oldversion.com. So obtaining the webaddress is not a problem. But your post lacks the most important part.
What old version are you seeking??
How can someone fulfill your request, when you did not technically, make one.
Please help yourself out by including a little more information that what your first post contains.
No one is going to guess as to which old version of Skype you are looking for.
Also, though in the future Oldversion.com may be archiving Mac software. This does not mean the majority of it's users, those that find the old versions, are going to be able to oblige as most are only familiar with MS Windows.