I understood in one of your messages that you performed an upgrade in the past, am I wrong?
Yes I performed three or four upgrades so far.
My current phabricator version from the version page:
phabricator d3b7a0f37c975397455d633254e9b4a1246023f9 (Fri, May 26) (branched from 9d37ad3022bfff8a2900b9d728e6abbb6a1e27f0 on origin)
arcanist 21fe07925b07cab0f73ec824fe8ce02f53b24fe0 (May 19 2017) (branched from 129d51fa0936c9bae48fadf3a3f39e26d69d24da on origin)
phutil d02cc05931b02c684d4c729510090591ca45f951 (Apr 29 2017) (branched from a900d7b63e954e221efe140f0f33d3d701524aae on origin)
Here is contents of my changelog.txt
============ CHANGELOG =============
Version 20150929-0 2015-09-29
* Updated PHP to 5.5.29
Version 20150901-0 2015-09-08
* Updated Phabricator to 20150901
Version 20150824-0 2015-08-24
* Updated Phabricator to 20150824
Version 20150817-0 2015-08-17
* Updated Phabricator to 20150817
* Updated phpMyAdmin to 4.4.13.1
Version 20150810-0 2015-08-12
* Updated Phabricator to 20150810
* Updated Apache to 2.4.16
* Updated PHP to 5.5.28
* Updated OpenSSL to 1.0.1p
* Updated MySQL to 5.6.25
* Updated phpMyAdmin to 4.4.7
Version 20150506-0 2015-05-08
* Dropping RC4 from Apache SSLCipherSuite directive
* Updated Phabricator to 20150506
* Updated phpMyAdmin to 4.4.3
* Updated PHP to 5.4.40
* Updated OpenSSL to 1.0.1m
Version 20150309-0 2015-03-09
* Updated Phabricator to 20150309
* Updated OpenSSL to 1.0.1l
* Fixed binaries for Git
Version 20150129-0 2015-01-30
* Updated Phabricator to 20150129
Version 20150108-0 2015-01-12
* Updated Phabricator to 20150108
Version 20141202 2014-12-02
* Initial release, bundles Apache 2.4.10, PHP 5.4.35,
MySQL 5.5.40, phpMyAdmin 4.2.12, OpenSSL 1.0.1j and
Phabricator 20141202