Download a file without SD card on android 2.3.4

So I just booted up my old Xperia Neo and found myself to be unable to do almost anything. I actually just wanted to download an app from the Playstore and test it. But when I open the Playstore, I get Error while retrieving information from server [RH-01]. Googleing how to fix that I found a post where someone mentioned that you need to install "gapps". So I downloaded that using my PC. But I cannot connect the internal phone storage to my computer, only the empty SD-card slot. No matter if I'm in MTP or MSC mode. So I fired up the browser on my phone and tried to download the files directly. But now my browser says "An SD card is required to download gapps[...].zip". I do have enough storage left on my phone. So basically the phone is bricked. Android version: 2.3.4 ROM: Xperia Slim v2.20 Root: yes Browser: default File explorer: none