Lost all existing user scripts from Tampermonkey after installing the app with exe installer

I lost all my user scripts installed in Tampermonkey after I installed your app with SaveFromNetHelper-Web-307.exe.
SaveFrom.net helper was the only installed user script when I launched Chrome back again. I had a number of installed user scripts before.

It wouldn't be such a big issue for me if there only were 3rd party scripts installed. Unfortunately, there also were my own scripts I wrote for myself and I don't have a copy anywhere.

Please, let me know how can I get the previous state of my installed user scripts back.

Chrome version: 38.0.2125.111 m
Windows 7 x64 (6.1.7601 sp1)

(I'm putting this into Questions, since it is my fault I wasn't careful enough to look for userscript directly, since I already was using Tampermonkey. However, you may also see it as a bug, if your installer is not supposed to remove installed user scripts from a client machine.)