I thank you for your timely and kind response.
Collated error(s) is in the attached file, please.
By the way, the files downloaded from the links you have kindly provided did not work in this instance.
Your further help should be appreciated.
271140-error-installing-sql-server-express-2019.pdf
Microsoft OLE DB Driver for SQL Server - C:\ProgramData\Package Cache{9D6F8754-28E9-4940-B319-3FC8588CF18F}v18.5.0.0\x64\ was not available.
The Message: The feature you are trying to use is on a network resource that is unavailable.
On browsing to C:\SQL2019\ExpressAdv_ENU\1033_ENU_LP\x64\Setup\x64 use ‘msoledbsql.msi’, the error indicated was that the ‘msoledbsql.msi’ that came with the software was not a valid package for the product Microsoft OLE DB Driver for SQL Server.
What I did was to search for and download the said file ‘msoledbsql.msi’, but it did not work either.
The Error:
An installation package for the product Microsoft OLE DB Driver for SQL Server cannot be found. Try the installation again using a valid copy of the installation package 'msoledbsql.msi'.
The same scenario played for ‘msodbcsql’.
And finally, SQL Server Express 2019 failed to install: