I get this error on CKAN:
About to upgrade:
* Upgrade: L-Tech Scientific Industries Continued 1:0.5.2.1 to 1:0.5.2.2 (cached)
Kan een gedeelte van het pad C:\Games\Kerbal Space Program\GameData\LTech\Parts\Science\SkyLab niet vinden.
Error during installation!
If the above message indicates a download error, please try again. Otherwise, please open an issue for us to investigate.
If you suspect a metadata problem: https://github.com/KSP-CKAN/NetKAN/issues/new/choose
If you suspect a bug in the client: https://github.com/KSP-CKAN/CKAN/issues/new/choose
So I think it 's just some file path issue but I'm not sure... Maybe it depends on the install location?