MapInfo retired the standalone 32bit Viewer.

Starting with MapInfo Po 17.0.2 64bit, there is a new viewer mode. Simply download and install the full MapInfo Pro 17.0.2 or later, and it will run in viewer mode if you are not licensed.

The download is avaible here -

https://support.precisely.com/product-downloads/

Note this will not open legacy Discover surfaces coloured grids. You will need to use SURFACES>Toggle Grid to convert them into Raster colour metadata first (they do not need to be converted to MRR).

More details are here

https://community.pitneybowes.com/blogs/james-stone/2018/12/06/unpacking-mapinfo-pro-v1702