Fix broken model fetch link

[KWNahyun]

As stated at issue #1602 currently model link has been broken. This commit addresses the problem by suggesting alternative model link that maintainer provided.

So, in here, we used the supplementary package 'gdown' to download google drive files. Fixes: #1602 Fixes: #2250

[hiibolt]

I second this merge, it works well on my machine, my research is on pause until a fix is passed!