Install fail

When I start the upgrade process (9.9.14 to 10.0) Preflight test of the upgrade wizard is OK but when I try to upload the upgrade package nothing happens but sugar jumps to the home screen. No error reports in the log. But system seams to run in a loop

LOG:
Tue, 20 Feb 2018 17:50:17 +0000 [UpgradeWizard] - setting session variables…
Tue, 20 Feb 2018 17:50:17 +0000 [UpgradeWizard] - At upload.php
Tue, 20 Feb 2018 17:50:18 +0000 [UpgradeWizard] - finding new files for upgrade
Tue, 20 Feb 2018 17:50:24 +0000 [UpgradeWizard] - *** UW using [ ] as source for patch files.
Tue, 20 Feb 2018 18:23:39 +0000 [UpgradeWizard] - setting session variables…
Tue, 20 Feb 2018 18:23:39 +0000 [UpgradeWizard] - At upload.php
Tue, 20 Feb 2018 18:23:39 +0000 [UpgradeWizard] - finding new files for upgrade
Tue, 20 Feb 2018 18:23:39 +0000 [UpgradeWizard] - *** UW using [ ] as source for patch files.

Thanks for any help!

Are you sure you don’t have errors in the logs? Especially php_errors.log.

You can try deleting (or renaming it temporarily, just for safety) the “upload/upgrades” directory, to clear left-overs from previously failed upgrade attempts.