A Victorian national park that has been closed for seven weeks during the hunt for alleged gunman Dezi Freeman has finally been reopened, but with restrictions.

It has been 49 days since Freeman allegedly opened fire and killed Senior Constable Vadim de Waart-Hottart and Detective Leading Senior Constable Neal Thompson, who went to execute a search warrant at his remote property in Porepunkah on August 26.

He was last seen fleeing into the bush around Mount Buffalo, with the nearby national park becoming a focus for officers and search crews.

Accused killer Dezi Freeman. (9News)

The Mount Buffalo National Park has remained shut ever since due to the ongoing police operation, but has been partially reopened today after staff checked all the facilities.

Most of the popular visitor sites, trails and roads are now accessible to the public, but some areas still remain restricted and prohibited.

Victoria Police said the park’s reopening “does not signify the end of the search for Freeman”, and officers will maintain a presence in the area.

“Despite these extensive searches and enquiries, police have not located Desmond Freeman. This work has, however, given Victoria Police the confidence that the park can now reopen, as we know how important it is for the local community,” Victoria Police said in a statement.

“With the park reopening, police are urging anyone with hunting or trail cameras to check their footage and share any information that may assist investigators.”

Victoria Police during the search for alleged shooter Dezi Freeman at Mount Buffalo National Park. (Joe Armao)

Victoria Police Chief Commissioner Mike Bush admitted that investigators were unsure whether Freeman was even alive.

“Is he still alive? We don’t know. Is he alive and still in the area? We have no real information to suggest that it’s occurred, but we never discount. Or has he been unable to leave the area and is being looked after by others? We don’t know,” he said at a press conference yesterday.

“All of those are assumptions, possibilities, and we plan and resource for those three.”

Freeman, born as Desmond Christopher Filby, is a conspiracy theorist and self-described sovereign citizen with what police said is an extensive knowledge of the bush and survival.

The 56-year-old has been known to police for a while and holds anti-police and government beliefs.

Porepunkah shooting victims Vadim de Waart and Neal Thompson. (9News)

Australian and New Zealand police have been working together to search for him since the double-fatal shooting on August 26.

Large areas of Porepunkah and the Mount Buffalo National Park have been searched, more than 800 people have been questioned by police, and investigators have followed more than 1600 clues and tip-offs, according to Victoria Police.

But there is still no sign of Freeman.

A $1 million reward remains for any information that can lead to his arrest.

Police urge anyone with information or who sees suspicious behaviour at the national park to contact Crime Stoppers.