Most recent activity at 45office.com appears to be an upload today of this PDF:
https://www.45office.com/images/uploads/Final_Trump_Trial_Memorandum.pdf
Wayback Machine archive (if ever needed):
Are either of the above sites officially part of President Donald Trump’s Office of the Former President?
We know that Trump established the Office last month after emails from the Office were sent to the media: https://www.wasobamaborninkenya.com/blog/president-trump-establishes-the-office-of-the-former-president/
For example last month the Boston Herald cited 45office.com as the source of the emails:
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saveamerica45.com now redirects to donaldjtrump.com
https://www.donaldjtrump.com/