@thnguyen3 for this issue I'll be contacting you directly via email! please be on the lookout! Also I'll be removing your contact information as this is a public forum!

Download and install Rokit Arduino add-on files
Before you can start using the Smart Inventor Board with the Arduino IDE, you'll need to download the Rokit add-on files. Click here to do that!
This is the part that hasn't been done correctly. as per your file location it states:

C:\Users\Efraim\Downloads\ rokitarduinov1-0-9-1 \rokitarduinov1-0-9\Rokit\Smart\Recovery_Smart-Inventor_160322\Recovery_Smart-Inventor_160322.ino:64:27: fatal error: SmartInventor.h: No such file or directory

The bolded section indicates that it is still located in the zip folder or not in the same location, please extract it.

-->Unzip the compressed file named “rokitarduinov1-0-9-1”.<--

Run the Arduino IDE.
Click the "File" tab.
Go to "Preferences."
Click the "Browse" button to find and select the folder where you unzipped “rokitarduinov1-0-9-1”.
Exit out of Arduino and then reopen it.
Click on the "Tools" tab and select the board you are using. If you're not sure which one you have, look on the front of your Smart Inventor Board and check the green sticker. For example, if your board says "Smart Inventor V2," you should select "Rokit-SmartInventor-mega32_V2".

@rickman30 If your board is not on the list you may not have installed the board files. Please do so by doing the following:

Download and install Rokit Arduino add-on files
Before you can start using the Smart Inventor Board with the Arduino IDE, you'll need to download the Rokit add-on files. Click here to do that!

Unzip the compressed file named “rokitarduinov1-0-9-1”.
Run the Arduino IDE.
Click the "File" tab.
Go to "Preferences."
Click the "Browse" button to find and select the folder where you unzipped “rokitarduinov1-0-9-1”.
Exit out of Arduino and then reopen it.

Click on the "Tools" tab and select the board you are using. If you're not sure which one you have, look on the front of your Smart Inventor Board and check the green sticker. For example, if your board says "Smart Inventor V2," you should select "Rokit-SmartInventor-mega32_V2".

Oh! I saw your e-mail as well, and looks like that's what I fixed earlier today! I'll mark this as solved.

@loui2 You are awesome!
awesome

Hello, I attempted to answer your question in your other thread/topic located here: https://forum.robolink.com/topic/67/install

Ill be copying & pasting my answer from there since your question seems to be the same:
"
Hello, the website pages seems to be constantly being updated (that's a good thing!), so if your Rokit Smart included some paper instructions with a specific link then it may be outdated.

I believe you can get started using this link:
https://basecamp.robolink.com/cwists/category#products=[3]&selected_sort_by=alphabetical

I found this link by:

Hope it helps!
"

@karthikeyan Hello, so you can adjust the speed using the IR remote controller. Use the top left and right buttons to adjust the speed of the truck bot. The Leds on the top of the SmartInventor board will indicate what speed level it is set at. Let me know if this solves the issue you are facing.