General ⇒ Upgrading an old version of LyX

[Khan]

Hello everyone.
I have been using LyX since 2007. I recently found that in my two laptops I have two different versions of LyX. The old laptop with a LyX version 2.2.3 and is running by Windows 7 Home Premium. The other laptop is with LyX version 2.3.6.1. Today I copied some of the files with version 2.3.6.1 to the old laptop with version 2.2.3. I couldn't open the files and it gives me the following message:
"the file is from a newer version of LyX and the lyx2lyx script failed to convert it."
I realized that I need to update (in fact upgrade) my 2.2.3 version. I downloaded 2.4.3 as the latest version from https://www.lyx.org/Download
and I installed it. Whenever I tried to open any file it gives me the following message:
"the procedure entry point createdxgifactory2 could not be located in the dynamic link library".
Then I uninstalled it and downloaded 2.3.6.1 from this link: https://ftp.lip6.fr/pub/lyx/stable/2.3.x/
I downloaded it as a zip file with a collection of folders and files. I don't know what to do next. How can I upgrade the application ? I am not good at technology so i appreciate if someone can help me here.
Thanks.