Based on the trend shown in the graph, it is clear that the new song 'Shining Lights' has experienced a decrease in downloads from February to June. This could be due to a variety of factors, such as lack of promotion or competition from other popular songs. However, using the data we have, we can estimate the downloads for July if the same negative trend continues for 'Shining Lights'.

First, we need to determine the average monthly decrease in downloads for 'Shining Lights'. From February to June, the decrease in downloads is approximately 250 (1000 - 750). This gives us an average monthly decrease of 50 downloads (250/5 months). Assuming this trend continues, we can estimate that there will be another decrease of 50 downloads in July, bringing the total downloads for 'Shining Lights' to 700 (750 - 50).

However, it is important to note that this is just an estimate and the actual downloads for July could be different. To counteract this negative trend, the manager should consider promoting 'Shining Lights' more and possibly releasing a new song to keep up with the competition. Additionally, they should analyze the trends and determine the cause of the decrease in downloads to prevent it from happening with future releases.