The phrase "appear to have released" is correct and usable in written English.
It can be used when indicating that something seems to have been made available or published, often based on indirect evidence or observation.
Example: "The company appears to have released a new software update, but I haven't seen any official announcement yet."
Alternatives: "seem to have launched" or "look to have issued".
García played his second round of the Deutsche Bank Championship in relative peace and quiet Saturday, the birdsong broken only by applause for his good shots, of which there were many, or cries of "Keep it rolling, Sergio!" The fans appear to have released García, a native of Spain, from the prison he built with a wall of words.
Other factions of the Taliban appear to have released videos showing members pledging allegiance to Mullah Mansour, in what is seen as an attempt to bolster support for him.
W. W. Norton does not appear to have released sales figures for the book.
But with no sign of slippage in Mr Barak's lead of almost 10 percentage points in the opinion polls, Mr Netanyahu appears to have released his potentially deadliest weapon - the closure of Orient House.
The 1st phase addition of test substance appears to have released most of the organic carbon 'trapped' in the sludge (via the solubilising action of the surfactant test item), the two phase design was implemented to reduce this unspecific degradation during the second phase addition (however, some still occurs) [5].
Microsoft appears to have released a slightly broken update for its aging Windows Live Mail program, which it claims will allow users to continue using it after changes are made to Outlook, Hotmail, Live and MSN accounts in the near future.
He did not appear to have been released by Sunday afternoon.
He did not appear to have been released by Sunday evening.
Though most foreigners appear to have been released, many Egyptians are still out of sight or in custody.
It does not appear to have been released to critics, but reader reviews on the reviews aggregator site rottentomatoes.com are less than favourable.
Of the films on the Internet Movie Database's "Top 250" list — a useful if occasionally insane ranking voted by the Web site's registered members — only two post-1948 movies appear to have been released in January.
