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If you paid a deposit to buy the property then it is up to them to get the non paying tenant out.
A seller has to give vacant possession both in terms of no people inside or stuff.
An average sale takes months so they obviously think obtaining vacant possession is not a problem and it is their problem not yours.
If they fail to deliver vacant possession , you sue their nuts off
I hope this helps if there are any further points please reply I will be happy to respond.