help with implementing my code

[picklejohndoe]

so i built my own downloader and want to add some of it into this code. and want to modify what exclusions are added. the downloader i built is far simpler but doesn't need direct download link. and downloads only from mega links. thats what i want to implement, also i wanted to change the exclusion part, similar to the way your add link works but now users will be able to add more than whats already provided, for instance i believe its set to add .exe file types as exclusions but only those. i would like it to be able to add even more or just specific ones like .dll or a specific folder or file.

i can send you my downloader if youre wanting to see what i did. it walks through the process of clicking keep files and all that in the background. i downloaded the sorce code for the downloader and tried loading it into visual studio but i never used c# before and i don't know what im looking for.