You could also look at Global Terrain Mesh at Simviation
The whole package is large a little over 8 GB but you down load it in sections so you can get what you want when you want.
Most individual .bgl files are around 12 mb.
Its LOD 9 or 70m. It covers from N60 latitude to S60 latitude for the whole world.
It is based on Shuttle Radar Mapping Missions that were done a few years ago.
Its here
http://www.simviation.com/fsdterrainsrtm.htm
Read the read me and down load the file map to figure out which files you need for Asia.
I did not follow the instructions to install it.
Just take the .bgl files and put them in a folder in the addon scenery folder
C:\{path to flightsim}\FS9\Addon Scenery\{new folder}\scenery\{downloaded .bgl files}
activate them as you normally would in FS.
This way they are very easily removed or disabled if need arise.
I used multiple folders for the whole install
North America
South America
Africa
Euro-Asia (because numerically the file numbers stretch over the two continents in a line)
Islands
Australia
Each one is its own folder so I can disable or enable sections at will.