To download GeoTiff it is best to use Web Coverage Service - WCS, see:
http://www.sentinel-hub.com/apps/wms/wcs-request

You do not need to bother with individual scene ID, it is sufficient to know:

-layer (composite) you would like to use for data processing (choosing amongst those in your configuration).

-area (BBOX)

-date/time

A WCS request for your case would be something along the lines:
https://services.sentinel-hub.com/ogc/wcs/08eeadbe-a7de-MASKED?SERVICE=WCS&REQUEST=GetCoverage&CRS=CRS:84&VERSION=1.0.0&COVERAGE=IW_VV_DB&BBOX=103.554393,-7.563114,19736.126303,-5.440448&RESX=60m&RESY=60m&format=image/tiff;depth=16&TIME=2018-12-19/2018-12-19

The area of your MBR is pretty large, so I could not go for highest resolution (RESX=20m&RESY=20m) due to the rule of “maximum size = 5000x5000 px”. If you pinpoint the MBR a bit more, you will be able to get 20m resoution.

Note that I have masked the instance ID so that it cannot be used by other users. If you replace “08eeadbe-a7de-MASKED” with your Instance ID, the request above should work.

If you want to do this in ArcGIS, you can check these instructions:
http://www.sentinel-hub.com/apps/wms/wms-integration-guide

You can configure the date/time settings in configuration utility, setting “Time range” FROM and TO to your desired date/time

Thanks gmilcinski, with your info I was able to download the tif file.

I just indicate a little mistake in the link you provided as there is a question mark before SERVICE:

https://services.sentinel-hub.com/ogc/wcs/08eeadbe-a7de-MASKED?SERVICE=WCS&REQUEST=GetCoverage&CRS=CRS:84&VERSION=1.0.0&COVERAGE=IW_VV_DB&BBOX=103.554393,-7.563114,19736.126303,-5.440448&RESX=60m&RESY=60m&format=image/tiff;depth=16&TIME=2018-12-19/2018-12-19

I am just point out for other readers that otherwise could have problems.

PS: Thanks for masking the ID

Thanks, I corrected in the original post as well.