If you're looking to Download Game Master Helper on your Chromebook laptop Then read the following guideline.

GMHelper helps Game Masters with reference material and generating random characters, loot, traps, encounters, names etc for TTRPGs and DnD games. All content is completely customizable. You can: - edit/update the existing example tables - create your own set of tables using the 'Create new' menu option in the main menu - share/download your table sets by using the share button on the main screen - import an existing table set use the 'Import file' menu option GMHelper works completely offline. All data is customizable, so can work with any TTRPG, including DnD 5e, ICRPG, ShadowDark etc.