Even if I open the documents with the 2019 version with in which were created, I get an error

[Ute Leone]

Good morning,
first of all, sorry english ...
I have the 2019 version of InDesign. I also downloaded the 2020 version (15.1 serious problems for the numbering of notes and the elements of the master pages, such as testatine… bug already reported by others). I uninstalled the 2020 version 15. to download the 15.0.3 version that "seems" to have no problems with the notes and headers. The problem, however, is this: I still want to open my documents with the 2019 version, because in the printing phase, and I don't want to have "loose errors" due to the 2020 version. Even if I open the documents with the 2019 version with which they have been created, I get an error saying that they were created with a later version and that to open them use 15.x or convert them. Because?
If I opened InDD 2019 and open the files from the menu or by dragging them into the application and, I repeat, the files were created with InDD 2019, why this error and I have to do the conversion?
Thanks for the possible solution

[Creamer Training]

Not sure why we would mind. Your schedule is only known to you. Some people don't reply back for months...

[Ute Leone]

Hi IDEAS-Training, I will update you.

[Laubender]

Hi Ute,

of course finish your job first before testing anything else.

Hm. But I would advice not to overwrite any of the older files.

Thanks,
Uwe Laubender

( ACP )

[Ute Leone]

Hi Uwe Laubender, at this point I think I will do a restore from InDesign's TimeMachine back-up (not the works). Or not? Then I'll have to fix something, I know ... But maybe it's the best solution. As soon as I can, I try ...

[Ute Leone]

I solved it with Creative Cloud Cleaner Tool. I restarted the Mac, then I reinstalled InDesign 2019 v. 14.0.3 and InDesing 2020 v. 15.0.3. It all seems ok. Thanks for the advice and patience.