While install .Net Framework version 4.7.2/4.8, may occurs below errors.
this is due to Start from version 4.7.2 or above, some of the Operating System may not support.

 Example: Windows 7


If you are Windows 7 User, may follow below solution to Update your operating system to Windows 7 (SP1)

Please refer to this Link:

Or, you may download from the link as below
For OS 32bit:

For OS 64bit:

For Window Server 2008 R2: