Where are Mint 14, 15, and 16 Mate downloads?

[bobpegram]

I still have Mint 13 on my computer. I want to update/upgrade to 18. I have been told the easiest way is to do it one version at a time - upgrade to 14, then upgrade to 15, etc. That avoids wiping the drive and starting over. Also, I have a dual boot Win7/Mint machine. Keeping the Win 7 partition makes wiping the entire drive something to avoid.
Mint used to have all versions available for download so I thought I could download any version at any point. Now only 17 and 18 ISO downloads are shown. Help. Thanks.

[all41]

No--you can only upgrade starting with Mint 17.
Back up your stuff and install fresh
You will most likely not have to lose your Win7

[Moem]

I still have Mint 13 on my computer. I want to update/upgrade to 18. I have been told the easiest way is to do it one version at a time - upgrade to 14, then upgrade to 15, etc. That avoids wiping the drive and starting over.

Sorry friend, but you were told wrong: moving up from 13 to 14 would mean a new install, as well. Not that this is possible: only currently supported versions are offered for download. On the bright side, like all41 says, there is no need to wipe your Win7 installation.