When I am using parallels, I get a notice that an upgrade is available. I request downloading of the update and it appears on the Mac desk top but will not open. I have tried to find a link of the Parallels site but only have the option for upgrading to Version 4. I have spent the last 2 days installing 4 with very poor results. When it was finally installed, the performance is FAR WORSE than Version 3 (so much for truth in advertising) so I removed it and went back to Version 3, hence the request to get to get a link for the update.