I waste my whole day working on Zotero. I downloaded it today, but after 73 files, it will stop. I deleted all tasks and again tried, but again all in vain. I will not use it again
If you'd actually like our help, you'll need to say what the actual problem is that you're experiencing — we don't know what you mean by "after 73 files, it will stop". See Steps to Reproduce for the kind of description we need.
https://www.zotero.org/support/reporting_problems for reporting issues.