MacOS – Mac App Store Download Failure – Clear Cache

I bought a program on the Mac App Store (Desk) on one of my computers.

I am running Yosemite on a different computer and I tried to install the program from the Mac App Store – while I was on a public WiFi connection that blocks the Mac App Store. The download failed – but any attempt since then on that computer fails to download that one app.

Whenever I attempt to "Install" the program in the Mac App Store it eventually times out and I receive the following error:

"We could not complete your purchase. The request timed out."
I can download and install other apps just fine.

When I attempt to download I see the following in the console:

2/13/15 9:53:20.491 AM storeaccountd[351]: ADI: {
    "Cache-Control" = "max-age=604800";
    Connection = "keep-alive";
    "Content-Length" = 0;
    Date = "Wed, 28 Jan 2015 15:26:24 GMT";
    Location = "http://10.66.66.66/denied.html";
    Server = "squid/2.6.STABLE21";
    Via = "1.1 8802 (squid/3.3.5)";
    "X-Cache" = "MISS from 8802";
}

I believe what has happened is that the App Store Web View has cached the redirect to the "denied" page from the public WiFi, but I don't know how to fix this.

1. I have rebooted
2. I have restarted App Store
3. I have Cleared Cache in Safari
4. I tried delete this files:
   • /private/var/folders/tv/mw9ndb1s7qn76_xtbg8zy3v80000gp/C/com.apple.WebKit.WebContent+com.apple.appstore
   • /private/var/folders/tv/mw9ndb1s7qn76_xtbg8zy3v80001z2/C/com.apple.appstore
   • /private/var/folders/tv/mw9ndb1s7qn76_xtbg8zy3v80001z2/C/com.apple.appstore/com.apple.appstore
   • /private/var/folders/tv/mw9ndb1s7qn76_xtbg8zy3v80001z2/C/com.apple.WebKit.WebContent+com.apple.appstore
   • /private/var/folders/tv/mw9ndb1s7qn76_xtbg8zy3v80001z2/T/com.apple.appstore
   • /private/var/folders/tv/mw9ndb1s7qn76_xtbg8zy3v80001z2/T/com.apple.appstore.PluginXPCService
   • /private/var/folders/tv/mw9ndb1s7qn76_xtbg8zy3v80001z2/T/com.apple.WebKit.WebContent+com.apple.appstore