Hi, I have stata13 on my computer and I typed -findit listcoef- in the stata window. I see the option for "spost13_ado from https://ift.tt/2W5XPQ7"
But when I try to click on it to install, I keep getting an error message:

Received fatal alert: handshake_failure
https://jslsoc.sitehost.iu.edu/stata/ either
1) is not a valid URL, or
2) could not be contacted, or
3) is not a Stata download site (has no stata.toc file).

r(5100);

Is something wrong with my Stata or is something wrong in how I am trying to install this?

Thank you in advance for your help!
Irina