TrueCrypt ceased development back in 2014.
Please refer to the below link to migrate to an alternative (BitLocker) from
TrueCrypt.
http://truecrypt.sourceforge.net/
From: Stefan Kanthak
Sent: Friday, 8 January 2016 9:32 PM
To:
Hi @ll,
the executable installers "TrueCrypt Setup 7.1a.exe" and
TrueCrypt-7.2.exe load and execute USP10.dll, RichEd20.dll,
NTMarta.dll and SRClient.dll from their "application directory".
For software downloaded with a web browser the application
directory is typically the user's "Downloads"