i tried this mod in 2.1 and had no issues, but i had to set compatibility:
1) open explorer, type in adress line: %appdata%\Factorio\mods\
2) rightclick "TostsChests_0.1.1.zip" -> extract all
(%appdata%\Factorio\mods)
3) open new folder "TostsChests_0.1.1" then subfolder "TostsChests_0.1.1"
(%appdata%\Factorio\mods\TostsChests_0.1.1\TostsChests_0.1.1)
4) edit "info.json" line 3: "version":"0.1.2"
5) edit "info.json" line 10: "factorio_version":"2.1"
6) save "info.json"
7) move one layer up, rename subfolder "TostsChests_0.1.1" in folder "TostsChests_0.1.1" to "TostsChests_0.1.2"
(%appdata%\Factorio\mods\TostsChests_0.1.1)
8) rightclick the subfolder now named "TostsChests_0.1.2" -> send to -> Zip
(%appdata%\Factorio\mods\TostsChests_0.1.1)
9) move zip-file "TostsChests_0.1.2" one layer up into folder "mods"
(%appdata%\Factorio\mods)
10) remove folder "TostsChests_0.1.1" in folder "mods"
(%appdata%\Factorio\mods)
11) start game, select version 0.1.2, enable mod
edit: i added the "current location" you are working at in brackets at the end of the line.
