Thank you very much, but that doesn't seem to be the cause of my 99% problem.
- run inimanager as administrator
- X-plane path correct
- no additional antivirus software / firewall
- drive c (70 gb free)
- try drive e (300 gb free)
- reinstalled inimanager, rebooted the computer
- many tries, always the same result:
Download ad ends at 99% of 100%
Active Downloads reports: no active downloads
no further action by inimanager, no installation