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It took me like 6 tries. The way that I found easiest was to wait for it to gain some distance after the first shot before shooting it again. (It will rush you on the second successful shot) Use the distance to reload and wait for it to get close. When it's close enough, it stops zigzagging. Unload all 5 rounds without missing and it should die.

If you're still having issues, click on bottom left corner of ramen packet. You need to click three times to fully open it, going up with the cut as it opens more.

You need to change your default install location. Search online how to change your default install location for whichever browser you use