The .version file supplied with KER contains a URL 1.3 version file. One suggestion is to provide the URL to this repo.

[LOG 21:54:44.148] MiniAVC -> S:\SSD Games\Modded KSP 1.4.3\GameData\KerbalEngineer\KerbalEngineer.version
NAME: Kerbal Engineer Redux
URL: http://ksp-avc.cybutek.net/version.php?id=6
DOWNLOAD: NULL
GITHUB: NULL
VERSION: 1.1.4.10
KSP_VERSION: 1.4.2
KSP_VERSION_MIN: 1.4
KSP_VERSION_MAX: 1.4.9
CompatibleKspVersion: False
CompatibleKspVersionMin: True
CompatibleKspVersionMax: True
CompatibleGitHubVersion: True
[LOG 21:54:44.148] MiniAVC -> http://ksp-avc.cybutek.net/version.php?id=6
NAME: Kerbal Engineer Redux
URL: http://ksp-avc.cybutek.net/version.php?id=6
DOWNLOAD: http://kerbal.curseforge.com/projects/kerbal-engineer-redux
GITHUB: NULL
VERSION: 1.1.3
KSP_VERSION: 1.3
KSP_VERSION_MIN: 1.2.9
KSP_VERSION_MAX: 1.3.1
CompatibleKspVersion: False
CompatibleKspVersionMin: True
CompatibleKspVersionMax: False
CompatibleGitHubVersion: True
UpdateAvailable: False

fixed