@rumanzo Thank you very much for this great work!

You may do not know about it, but latest GO dropped Win7 support.
Everything compiled with that, breaks on Win7 (both 32 & 64 bit).

Here is what happens:

C:\Users\IT>E:\bt2qbt_v1.21_amd64.exe
Exception 0xc0000005 0x8 0x0 0x0
PC=0x0

runtime.asmstdcall()
        /usr/local/go/src/runtime/sys_windows_amd64.s:65 +0x75 fp=0x22fca0 sp=0x22fc80 pc=0x4626d5
rax     0x0
rbx     0x666e00
rcx     0x6b9900
rdi     0x7fffffde000
rsi     0x22fea0
rbp     0x22fde0
rsp     0x22fc78
r8      0x0
r9      0x22fee0
r10     0x68b738
r11     0x21
r12     0x22fec0
r13     0x1
r14     0x6667a0
r15     0x0
rip     0x0
rflags  0x10293
cs      0x33
fs      0x53
gs      0x2b

If you do not wish to change GO version back to the last known Win7-compatible one,
I'd like to recommend to apply a patch, where Your APP first checks the OS version minimum,
and report it to the user, to download the last known working version: 1.20. (+link)

Hello! Thank you for you notice, I didn't think about it.
I suggest the better way is to resolv #47 and build new version with to the last known Win7-compatible version of go. I think it is not a problem, I don't use newest features in my code.

I suggest the better way is to resolv #47 and build new version with to the last known Win7-compatible version of go. I think it is not a problem, I don't use newest features in my code.

I agree.
Keeping Win7 compatibility would be the best solution 👍
There are still many PCs all over the word, those can be used perfectly fine as a torrenct PC running a simple Win7 behind a NAT router.
(In my experience W10 64bit is running the same programs 4x - 8x slower because of "sandboxing". And old PCs may have no proper drivers for the newer OS.)