Ok, I thought that the latest version was 2.4.6 not 2.46.

Now i have calibre v.2.46 and suddenly requests stopped working.
Code:
Plugin removed
Plugin updated: CalibreBookBrainzPluginBBID (0, 0, 1)
calibre 2.46 isfrozen: True is64bit: True
Linux-3.16.0-4-amd64-x86_64-with-debian-8.1 Linux ('64bit', 'ELF')
('Linux', '3.16.0-4-amd64', '#1 SMP Debian 3.16.7-ckt11-1 (2015-05-24)')
Python 2.7.9
Linux: ('debian', '8.1', '')
Successfully initialized third party plugins: CalibreBookBrainzPluginBBID
Starting up...
Traceback (most recent call last):
File "site-packages/calibre/gui2/ui.py", line 152, in __init__
File "site-packages/calibre/gui2/ui.py", line 166, in init_iaction
File "site-packages/calibre/customize/__init__.py", line 582, in load_actual_plugin
File "importlib/__init__.py", line 37, in import_module
File "site-packages/calibre/customize/zipplugin.py", line 179, in load_module
File "calibre_plugins.CalibreBookBrainzPluginBBID.ui", line 11, in <module>
File "site-packages/calibre/customize/zipplugin.py", line 179, in load_module
File "calibre_plugins.CalibreBookBrainzPluginBBID.main", line 11, in <module>
ImportError: No module named requests
Key u'S' for shortcut Zapisz na dysku is already used by Połącz wpisy książki, ignoring
Started up in 2.17 seconds with 14 books
I don't realise how that could have happened.
I've installed requests for python and python3.