Downing left the club on Saturday following Friday night's 4-1 reverse at Hartlepool United, a result that left the Robins rooted to the foot of the League One table with just three points from their opening six games.
He had only been in charge of the side for 11 months, as he replaced John Ward following his move north to take control of Carlisle United.
xxx's first game in charge will be the visit of Bristol Rovers - who are also struggling in the opening games of the campaign, with just five points to their name so far - to Whaddon Road on Tuesday night.
He had only been in charge of the side for 11 months, as he replaced John Ward following his move north to take control of Carlisle United.
xxx's first game in charge will be the visit of Bristol Rovers - who are also struggling in the opening games of the campaign, with just five points to their name so far - to Whaddon Road on Tuesday night.