Flink was originally sentenced to life in prison for seven murders and three attempted murders in Falun in June, 1994.
Flink was 24 at the time of the attack, where he shot seven people dead and injured three others in the vicinity of Dalregementet, where he was stationed and held the rank of second lieutenant in the armed forces.
He had earlier argued with his girlfriend and was heavily intoxicated when he fired 51 rounds from his military-issued AK5 rifle. The victims, five women and two men aged 20 to 35, were all in a park in the centre of the town at the time.
Last week, after having served two-thirds of his sentence, Flink was ordered free from prison, and has since spent time in transition where he is prepared for life on the outside.
He is set to return to daily life on Wednesday.
While the TT agency noted that there could be a risk relating to Flink's previous alcohol abuse, probation officer Petra Tullgren said there wasn't much the prison could do.
"We have no power to say someone can't drink alcohol. There is no legal support for a move like that, and it's probably impossible to monitor anyway," she said.
Flink has previously said in interviews that he never intends to drink again for moral reasons.