Is there anyway I can install Minecraft without internet?

I think the MC app you downloaded is for the tablet only and it won't work on a normal pc… So that's why its not working. If you have access to another computer you could download MC from there, save it to a flash drive, and then install it on your computer, but it sounds like you don't have another computer so well another thing you could do is tether the internet from your tablet to you computer and then just download MC straight from your computer. I know there are apps you can get that will allow you to tether internet from a phone or tablet, but i don't think they are free… I remember buying an app like 4 or 5 years ago and it was like $10 but maybe they are cheaper now. Also your tablet may already be able to tether so i would look into that, hope this helps

BEFORE ATTEMPTING TO INSTALL MODS, BACKUP YOUR SAVES! YOU HAVE BEEN WARNED!

Step 1: First, you have to download a Minecraft Mod of your choice. You can use google to find mods
Step 2: Now, you have to open your minecraft.jar file. This can be found here: /Users/[Your user]/AppData/Roaming/.minecraft/bin. It can also be found by searching for "%appdata%" in your start menu. Once you have searched for "%appdata%," you have to follow the same path as stated above.
Step 3: Open your minecraft.jar with Winrar by simply dragging the.jar into Winrar.
Step 4: Open the.zip/.rar/folder of your mod and drag and drop the contents into the minecraft.jar. Sometimes some contents must be entered in different places besides just the main minecraft.jar directory. Before this step, you should check the original post of the mod to know where to put the appropriate files. An example of this sort of mod is the Mo' Creates Mod by Dr Zhark.
Step 5: Delete the META-INF folder in the minecraft.jar. Close minecraft.jar.
Step 6: Open Minecraft and play!

If your mod doesn't work properly or you get a black screen at the Minecraft startup:

Step 1: Delete your minecraft.jar found here "C: Users(insert computer name here)AppDataRoaming.minecraftbin".
Step 2: Open Minecraft, let it auto-update so your.jar can be restord.
Step 3: Attempt to re-install mod (If you want).