Success

[leplouc]

Upgrade directly from High Sierra, it took a long time (more than 1 hour).
Everything is working OK excepted "Preview" : spinning coloured wheel and no jpeg displayed. PNG are ok.
Regards

 

[BreBo]

@leplouc, please add details of your Motherboard to your profile (personal details).
If you have a prebuilt computer enter make and model instead of motherboard.

Profiles are mandatory so that others can assist you.

See post #247 of Quicklook Doesn't Preview jpgs, mp3 nor mp4 for possible solution.

 

[cdnail]

Upgrade directly from High Sierra, it took a long time (more than 1 hour).
Everything is working OK excepted "Preview" : spinning coloured wheel and no jpeg displayed. PNG are ok.
Regards