Cloud control Center can give an error when installing add-ons like:
"Add-on %addonname%: Failed to save downloaded installer / uninstaller for add-on. The target folder is %temp%. Please check the disk space or permissions".
The cause of the error can be that InstallParams.zip is missing in the Cloud Repository. Please make sure that InstallParams.zip exists in your Cloud Repository.
If this does not solve your issue you will need to contact SAP support as the issue happens prior to the addon installer actually starting.