Minutes ago, I read a post by banana, and thought that there might be other codeforces users who have the same need. I used to write a tool to download all my solutions, and I'd like to share with others.
Then put the dlls and the exe in a folder, run downloader.exe and input your handle, and then all last accepted solution will be download to this folder.
Source code of this tool can be found here.
If you have any problems using this tool, leave a comment or send me a message.
UPD1: I am sorry that there is no boost or libcurl on my new laptop, so I think I will no longer update this tool. However, you can DIY as the source code is provided.