window报错: argument of type 'WindowsPath' is not iterable

[huan415]

.towhee不存在时，加载文件，加载文件后会 install requirements.txt ，此处window会报错

[sre-ci-robot]

Welcome @huan415! It looks like this is your first PR to towhee-io/towhee 🎉

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (1dd3251) 76.01% compared to head (5c25ed3) 76.01%. Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2653 +/- ## ======================================= Coverage 76.01% 76.01% ======================================= Files 407 407 Lines 20820 20820 Branches 2763 2763 ======================================= Hits 15826 15826 Misses 4104 4104 Partials 890 890 ``` | [Files Changed](https://app.codecov.io/gh/towhee-io/towhee/pull/2653?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=towhee-io) | Coverage Δ | | |---|---|---| | [towhee/hub/downloader.py](https://app.codecov.io/gh/towhee-io/towhee/pull/2653?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=towhee-io#diff-dG93aGVlL2h1Yi9kb3dubG9hZGVyLnB5) | `96.29% <100.00%> (ø)` | |

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[junjiejiangjjj]

Tks for this PR

[junjiejiangjjj]

/approve /lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: huan415, junjiejiangjjj

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/towhee-io/towhee/blob/main/OWNERS)~~ [junjiejiangjjj] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment