Arduino for STM32

I have on my computer an Arduino 1.8.3 fitted with Roger's package, after a manual installation.
i would like to install another instance of the IDE, version 1.8.12 and install in it the new STM32Duino package.
I have read several opinions about doing so. In general it is advised to use the ZIPped IDE downloaded from the Arduino.cc website, and to configure it specifying a different directory for the sketches.
Unfortunately,there remains a directory that I cannot change, which is

C:\Users\<username>\AppData\Local\Arduino15

.
This directory contains parts of the package. I am afraid of having a mixup even if I install the IDE in a different directory, since the Arduino15 directory seems to be a fixed name. So I am interested in your experience on this topic.

You can add a "portable" folder at the root folder of Arduino then all will stored in this folder: shetch, libraries, cores, preferences,....

https://www.arduino.cc/en/Guide/PortableIDE

I used since several years to have several versions and config

Thanks a lot. I could install a newer version without impacting the previous one.

Welcome.
It is a feature not well known but very useful.
You can also put it on a mass storage and share it easily