Using former catalog after re-installing Lightroom 3.6

[fabioram]

My notebook had a problem and a full re-formating was necessary, After that, I managed to download a version of my former Lightroom 3.6 (64 bit), as instructed by Adobe, successfully.
However, when I open it, it recognizes the Library, showing the thumbnails exactly as they were, BUT when clicking on the image it shows the following message: "The file named "IMG_0738.JPG" is offline or doesn't exist".
It's a library of around 20 thousand pictures, and re-indexing one by one is not an option. How can I fix it?
Tks.
Fabio (Brazil).

[Bani Verma]

Moving this query to Lightroom​ community for quick and better help.

[AxelMatt]

Do the pictures are located on the same path after the rebuild of your notebook as they were located before thr rebuild?

If not then you have fix it manually. Here you'll find additional informations about the necessary steps.

Adobe Lightroom - Find moved or missing files and folders

https://www.lightroomqueen.com/lightroom-photos-missing-fix/

[dj_paige]

You can fix entire folders at once, or even entire hierarchy of folders at once, see Figure 4 and associated text here: Adobe Lightroom - Find moved or missing files and folders

[trilokd15867614]

Hiii