Hello @Kaleym
Thank you for reaching out on the community and telling us about your issue. To address your original question about the online app yes you'll still be able to use the mobile sync with your accounts.
First thing would be to find a working file here. Do you have a flash drive or potentially a cloud backup that you've previously used? If you do that'd be a place to start with so we can try accessing the file. The other thing is that if you have a local IT shop or computer services chain store (Best buy, Staples, Office Depot, Etc) all should have services that should be able to help with recovering hard drive data. Recovering it will allow us to ideally get a file we're able to work with.
Once you get a file that was previously on your PC the article here should help guide you through converting the PC file to a Mac file. If you do run into issues past this I would recommend contacting quicken support to see what the best actions are to convert the file.
Thanks,
Quicken Francisco