.... after really really long delay

This sounds similar to the difficulty that I currently have in accessing many of the files at sisyphusion.tk (and lots of other places on the internet) via http.
I'm assuming that the problem with the sisyphusion.tk files that I can't get (eg http://www.sisyphusion.tk/ppmindex.html) is the same as the problem with other files that I can't get (eg http://strawberryperl.com/releases.html).
But maybe there's some different issues at play there.
Can you successfully browse to either of those 2 links ?

According to the sisyphusion.tk raw access logs, when I try to browse to ppmindex.html, sisyphusion.tk server receives the request and replies with the usual 200 response, but that response never gats back to me. Every 30 seconds the browser sends off another request, with exactly the same result. After the 10th request has been sent, the browser just gives up and times out.

I grabbed the raw access logs for what might be your attempts to ppm install Gtk3, and I've stuck 'em on my scratchpad. There's a couple of 416 errors in relation to requests from Mozilla. The "bytes" number is wrong - which, I guess, explains the "416". And there's a couple of 404's and some 3xx redirects (again resulting from requests from Mozilla) but, AFAICT, the requests from D:\perl\citrusperl\site\bin\ppm.bat\0.1 are all being successfully met, except for a legitimate 404 for GET /ppm/file:Image-Magick.ppd.ppd
However, maybe that's not you ... if you want to send me your IP address I can take another look.

Cheers,
Rob