Do I need to download an app to watch They Banished Me as a Monster, Now I'm the Strongest Witcher?

No. It plays in any mobile or desktop browser, so there is nothing to install.

They Banished Me as a Monster, Now I'm the Strongest Witcher — Watch Free (45 Eps)

Where can I watch They Banished Me as a Monster, Now I'm the Strongest Witcher online for free?: The first 15 episodes are free on dramatap and play straight in your browser — no app download and no account needed. The rest of the episodes are part of dramatap VIP.
How many episodes does They Banished Me as a Monster, Now I'm the Strongest Witcher have?: 45 episodes in total.
Which app is They Banished Me as a Monster, Now I'm the Strongest Witcher originally from?: It was originally released on NetShort.
Do I need to download an app to watch They Banished Me as a Monster, Now I'm the Strongest Witcher?: No. It plays in any mobile or desktop browser, so there is nothing to install.