Problem with Upgrade to v. 2.05

I have an issue with my upgrade to version 2.05. I have done a variety of upgrades over the past several years, without problem.

The site is https://avianflu.futurehs.com

While I can see the site, when I try to click on either a page or to a prior post based on the category, I get the following message:

404 error

Not Found

The requested URL https:// was not found on this server.

In addition, if I add a new post, I get an error that says:

The document has moved here.

Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

The new post is in the blog, but I get the error when I go to the add page.

My site is set up on a sub-domain of my site. While the physical location is futurehs.com/avianflu I have it redirected as a subdomain to https://avianflu.futurehs.com.

This has worked for several years without a problem.

I would appreciate any help in resolving. I typically get ~ 2,500 visits a day, so I would like to resolve ASAP.

Thanks