[hjalali13]

When I try to get the RS3 client running (I have the official Runescape client installed), I get a prompt telling me "You'll need a new app to open this Jagex-Jav". Then it gives me the option to look for one in the Microsoft Store. Is there a fix for this?

 

[party]

Client & Site Support | Community | RuneMate

 

[american express]

When I try to get the RS3 client running (I have the official Runescape client installed), I get a prompt telling me "You'll need a new app to open this Jagex-Jav". Then it gives me the option to look for one in the Microsoft Store. Is there a fix for this?

See this thread for common issues:
Tutorial - Runemate Spectre – Common Issues & Troubleshooting | Community | RuneMate

You need to download the official Runescape client from the official Runescape website.

 

[aidden]

Moved to correct section (Client support).

 

[arbiter]

Tutorial - How to Use RuneMate Spectre | Community | RuneMate

Re-read the updated instructions particularly the section that talks about which official client to download.

Lastly, you must select a client. A client is an application that loads the RuneScape game into it. At of the time this tutorial was created, we only support the RuneScape official legacy client (and RSU for our Linux users). If you do not have it yet now would be a good time to download and install it from RuneScape's official download page. Scroll down to the bottom of the page until you find "Other Ways to Play > Legacy Client." This is the one you are looking for. Please keep in mind that you must restart RuneMate after installing the RuneScape client.