Thank you for this, Kissonline!
Kissonline wrote:If any friend can help find the HD version, I will be very grateful!

O.K., let me try. It will take some explaining.
This story has been filmed many times.
2016 version here:
[REL] Les Malheurs de Sophie (2016)
1946 version here:
[REL] Les malheurs de Sophie (1946)
There is also an animated series available online.
Les malheurs de Sophie (TV Series 1998)
Now, back to your 1981 version. From what I can piece together of Google-translated webpages, it seems it was released to TV in 1979 in a two-hour version. This is the VHSrip version you released, the most complete version available. I prefer the Kissonline VHS release because it is UNCUT!
Then in 1981 it was released theatrically at 86 minutes.
480p DVD-quality in French without subtitles:
https://ok.ru/video/1822376593930
Like this post to see ed2k links [751.26 MiB]
Also, the first HALF of the full version is available in higher quality.
This half is only 58 minutes.
A rough-looking 1080p in French without subtitles:
https://www.youtube.com/watch?v=XPdzpvJYZkM
Like this post to see ed2k links [675.05 MiB]
Following the links at the Youtube page, it says the entire version is here:
https://madelen.ina.fr/programme/les-malheurs-de-sophie
You have to subscribe to their service in order to see it. I am assuming it is in 1080p but I can not verify it. HOWEVER ... WARNING ... that page also says the full version is only 1 hour 26 minutes. They already had the full uncut version of the first "half" on YouTube, so the rest of it should be another hour. In the 86 minute version, the first half ends about 40-some minutes in. Their runtime could be incorrect, or they really messed things up.
I do NOT plan to subscribe and get the madelen.ina.fr version.