Cannot install drivers for MTX65xx on Windows 10 64 bit for Telekom Puls Tablet

The normal tablets name is "Telekom Puls" and is from a German ISP. When I turn Developer Mode and Debug Mode on, it identifies itself as "MT65XX Android Phone" in the Windows 10 Device Manager.

Hardware ID:

Code:

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    USB\VID_1BBB&PID_201D&REV_????&MI_01
    USB\VID_1BBB&PID_201D&MI_01

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Compatible ID:

Code:

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    USB\Class_ff&SubClass_42&Prot_01
    USB\Class_ff&SubClass_42
    USB\Class_ff

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Device Instance Path:

Code:

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    USB\VID_1BBB&PID_201D&MI_01&3A3241C5&0&0001

---

I was looking at different websites on how to make universal adb drivers, but it won't work, Windows 10 64 bit is complaining then that the .inf file has been tampered with and refuses to install it.

I looked into multiple similar posts (also here on XDA), but none of them was conclusive. Does anyone have pointers or advice on how to make this thing work?

Also tried the ADBDriverInstaller by Koush, it says incompatible with Windows 64 bit when I try to download the driver.
I also tried various other prebuilt drivers from around the net, but none helped.

Is there any way to get this Tablet installed so I can start making apps?
I would appreciate any help.

ps.: I hope this is the right place, I am new to these forums but I read a lot here and you guys rock. Neither Reddit nor Stack Exchange could help me, so here is my hope for you guys :).

pps: Can't include links to the stuff I tried :(